Diagnosis
A fiscal year variant has not been defined for company code MARS.
System Response
A fiscal year variant is required to determine an accounting period from the posting date.
Procedure
Maintain a fiscal year variant for company code MARS using the FI configuration functions.
SOLUTION:
STEP 1: Go to T Code OB37 or follow the below Path:

STEP 2: Position your company Code and Provide Fiscal Year Variant against it.

Regards,
Adharsh KS