(1) changing transaction behavior.
AFAIK you cannot hide/protect easily some fields in this transaction, fields status group doesn't rely on transaction
You could create some validations (checking Transaction Code in the rules) to raise your warnings, and even some error when user change a not allowed field, you could also create a substittion rule to change some values.
Use an enhancement at end of FI_FIELD_SELECTION_DETERMINE at your own risk
(2) Looking for FM?
There is no BAPI for FBV2 (Read 2092366 - Parking with BAPI_ACC_DOCUMENT_POST and 2445449 - Parking document issue due to function module PRELIMINARY_POSTING_FB01.)
Create a BDC and execute a CALL TRANSACTION.
Use FM of group F040 at your own risk...
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