How to Define Document Type and Number Range in SAP FICO

Enter Transaction Code SPRO in SAP Command Field

In the next screen, Select 'SAP Reference IMG'

In the next screen "Display IMG'  Follow the menu path

Financial Accounting -> General Ledger Accounting -> Business Transactions -> G/L Account Posting -> Carry out and Check Document Settings ->Define Document Types

In the next screen, Press 'New Entries' Button from the Application Toolbar

For Maintaining New Document Type

In the next screen, Enter the Following

1. Enter a unique Document Type Key
2. Enter the Document Type description
3. Select a number range for the Document Type
4. In Account Type Allowed Section , select the Account type which you would like to do posting
5. Enter Appropriate Selection in the Control Data Section