Business Area and Business Place Mandatory

Hello All,

I want to write a BTE for making the Business Area and Business Place Mandatory.

Scenario is like

If Fiscal Year - 2013 then only Business Place should be Mandatory.

If Fiscal Year - 2012 then there are two cases -

1- If New Entries are being created then both Business Area and Business Place are Mandatory.

2 - If Clearing of Old Entry is being done, then there should be NO Error.

Any Suggestions how to implement this requirement.

Regards,

Jashan Koshal