You can use this field if you want to apply the purchase header to a document that has already been posted. If so, enter the number of the document that the purchase header should be applied to.
To see a list of the vendor's open entries, click the AssistButton in the field.
If you select the document number from the list, the program will automatically enter the appropriate type in the Applies-to Doc. Type field.
If you enter the document number manually, you must remember also to enter the applies-to document type or else the program will look for a document with the Blank type.
You can read more about applying entries in the Help for the Apply Vendor Entries window.