The "New" option located at the bottom of the Sales Invoices browser is used to record a new invoice. Click the down arrow next to the New button to select an invoice type.
You enter general invoice information in the fields available in the upper section of the Invoice tab in Sales Invoice window. 
Heading Info
No: The tracking number of the invoice. Alphanumeric characters can be used to enter the employee number. The slips are sorted by their numbers. This field is mandatory.
Date: The date of transaction. This field is mandatory.
Time: Indicates the time in which the transaction is recorded.
Aux. Code: A secondary code field used to classify invoices. Contains 10 characters. The Aux. Code is used to classify invoices by company specific criteria. The user can use this field to record any necessary information that is not included in the slip.
Authorization Code: Used to define detailed authorizations. The string is 10 characters long. Each user may be authorized to use different records depending on job definitions. A planning process must be performed for detailed authorization definitions. First, slips to be accessed or processed by each user or user group should be specified. Then, separate authorization codes are assigned to slip groups accessible by each authorization group. Slip based encryption can be performed by authorization code. In this way, only the users who log in with the specified authorization code can access and process the slips.
Document No: The invoice document number. An alphanumeric field of 8 characters long. Documents from different companies may have the same number. Slips are not sorted by document number. Therefore, more than one slip may have the same document number.
Document Date: The date of the document.
Contract Number: The number of the contract related to the sales invoice.
e-Invoice: If a sales invoice is an e-invoice, this box is checked. When an AR/AP is selected for the invoice, this box becomes active for AR/APs using e-invoice, and it is checked automatically. If e-invoice will not be used, then this box is unchecked.
If the control type is selected as "Based on Company" for e-invoice user companies, it would be sufficient for the AR/AP to be an e-invoice user. If the control type is selected as "Based on Org. Unit", then it is checked whether the AR/AP and the organizational unit are e-invoice users.
Scenario: The type of invoice which will be sent via e-invoice is designated in Scenario field. The options are Base Invoice, Commercial Invoice and Associated Goods Invoice. The corresponding option designated in AR/AP definition is transferred to this field. Tax ID number, T.R. ID number, label information and address information (Country) are not mandatory in AR/AP record of which Scenario is Associated Goods Invoice; however, the same fields are mandatory if the Scenario is Basic Invoice or Commercial Invoice. If you select an AR/AP record with Associated Goods Invoice scenario and you want to change the scenario, note that Tax ID number, T.R. ID number, label information and address information (Country) of e-Invoice AR/AP must be specified.
Return Type: Return Type field becomes active only if e-Invoice Scenario is Associated Goods Invoice. The options are Select, Tax Free and Vat Off.
When you select Tax Free, you can enter in VAT to Be Returned field under e-Service Details > Tourist Info tab.
When you select Vat Off, you cannot enter in VAT to Be Returned field under e-Service Details > Tourist Info tab.
Sheet: Sheet checkbox becomes active if e-Invoice Scenario is set to Associated Goods Invoice. It indicates the form of invoice. When unchecked, it indicates that Associated Goods Invoice is an e-invoice.
In case of any issues, a paper invoice is made out on behalf e-Invoice AR/AP that is sent to the intermediary firm with Associated Goods Invoice. Once an invoice is made out in sheet form, it cannot be prepared as an e-Invoice later.
e-Archive: This field indicates whether a sales invoice is an e-Archive invoice. Invoices which are not within the scope of e-Invoice are checked automatically as e-Archive.
e-Invoice / e-Archive Type: This field is used to select the type of e-Invoice / e- Archive. "Select" option is used for normal e-Invoice / e- Archive invoices. These are normal invoices in which no modification is made.
Special Assessment is a type of invoices issued for tobacco, silver, gold, journals and magazines, local transportation and phone card sales.
Exception covers export deliveries and related services, merchandise exports, service exports, contract services provided for customers in free zones etc.
Vehicle Registration refers to vehicle registration invoices.
Deduction indicates the invoices to which deduction is applied.
e-Invoice / e-Archive Type field is set to Exception value by default if the scenario of the related e-invoice is Associated Goods Invoice, and it cannot be changed. Normally, VAT amount must be zero for invoice type to be Exception. Regardless of this criterion, VAT Exemption Code is "501" and VAT Exemption Reason is "Sales Made by Calculating VAT for Those Who Do Not Reside in Turkey (Associated Good)" in Associated Goods Invoices and these cannot be changed.
Progress Payment No: This field is available in Service Sales Invoices. If Service Sales Invoice has Project Management Progress Payment connection, user opens Progress Payments browser from this field and make a selection from the progress payments in Approved or Paid statuses. Progress payments must have contract connections. Progress payments which are not related to any contract will not be listed for selection.
Online Sales Invoice: It is checked to indicate that invoices within the scope of e-Archive come from online sales operation. If Org. Unit e-Archive user is not the AR/AP e-Archive user selected for the invoice, e-Archive option appears in this section.
Organizational Unit: Indicates the organizational unit of the transaction. This field is used to associate the purchasing transactions with one of the defined organizational units of the company. If the selected Organizational Unit is an e-invoice user (if the AR/AP is an e-invoice user), then the e-invoice option in invoice form will be automatically checked. If e-invoice will not be used, this option is unchecked.
Warehouse: The locations that are used to store the company's goods or used for other purposes (such as scrap or production) are called Warehouses. Warehouses are specified in connection with the Company or Division definitions. This field is used to specify the warehouse of the slip or invoice.Warehouse can be entered either for the slip bottom or for the transaction on the line. In this way, transactions of the same AR/AP with different warehouses can be recorded on a single slip.
Department: Activities or activity groups within an organization that are independent from each other in terms of organization and accounting. This field is used to associate the transaction with one of the defined departments of the company.
AR/AP Code: The AR/AP code of the invoice.
AR/AP Title: The AR/AP title of the invoice.
Trading Group: The trading group code related to the invoice. Trading Groups are listed, and a selection is made. If a trading group is specified on the AR/AP of the slip, this value is displayed as default. This data can be changed if necessary.
Payment Plan: The payment plan code to be applied to the invoice bottom. If a payment plan is specified in the AR/AP for the AR/AP transaction, it is transferred into this field as default. Can be changed if the slip or invoice will be closed according to a different payment plan.
Salesperson: Indicates the salesperson related to the transaction. Recorded employee definitions are listed, and the related definition is selected.
Sales Representative Code: The sales representative code of the AR/AP related to the invoice. Sales Representatives are listed, and the related definition is selected.
Association Code: If the AR/AP of the invoice belongs to an association, the related association is automatically displayed in the field. If the AR/AP belongs to more than one association, the first defined association code is displayed in the field. When the association code is changed, the unit prices of the invoice lines are updated.