Business Area not getting displayed

Dear Experts,

I have an issue regarding the Business area.

After entering the Business area in certain Transactions like FB60, FB70, F-43, F-53, MIRO, etc. my Business area field is getting blanked as soon as i enter my Business area there.

We have made the Business area field Mandatory in the Field Status variant and in Posting keys also .

Even we have not defined any Substitution.

Kindly suggest me the solution.

Regards,

ASHUTOSH.