I am posting a customer check payment in F-28 but I got the above error. I had checked out all the configuration of both the Gl account & posting key in Field Status Maintainence. The output is as follows:
Rules for posting key 15 and acct 75010 set incorrectly for "KOSTL" field
Message no. F5272
One of the rules specifies that the field demands a required entry, the other rule says that the field is to be suppressed.
Correct one of the two rules for the field selection.
You find the field status group in the G/L account master record:
You can find the rules for the field status group in the Financial Accounting Implementation Guide in the activity Maintain field status variants.
You can find the posting key in the Financial Accounting Implementation Guide in the activity
Define posting key.