See C:\Users\Admin\Linc Communications\Linc - All - General\Support Documentation\VAT Return procedure for PDF
VAT REPORT SETUP
Important fields to setup before doing the VAT return. 
The report version is setup by searching VAT Reports Configuration and selecting the relevant codeunit. Most important codeunit is ID 745 – VAT Report Suggest Lines
Another important setup is to enter a number in the Box No. field of the VAT Statement.
VAT RETURN PERIODS
Create a new VAT Return. Open the VAT return card
Click Process->Suggest lines
Fill in the relevant details and click OK
Under the Report Lines fast tab, the open entries will be calculated.
Confirm that the difference is Rnil (or acceptable) and click Process->Release. Once this step is completed the Submit and Mark as Submitted buttons will become available.
After clicking Mark as Accepted, the Calculate and Post VAT Settlement button becomes available.
Choose the relevant posting date, settlement account and Post button. Clicking on print will close the open entries and post it to the VAT return.
After the refund/payment is received/made, capture the received date and change the status to closed.
