Rules for posting key 21 and acct 160000 set incorrectly for "PROJK" field

I going to Make the ERS Invoice cancel, the system will give this error, How to set this?

Rules for posting key 21 and acct 160000 set incorrectly for "PROJK" field

Message no. F5272

Diagnosis

One of the rules specifies that the field demands a required entry, the other rule says that the field is to be suppressed.

Procedure

Correct one of the two rules for the field selection.

You find the field status group in the G/L account master record:

Execute function

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.

Regards

sapman