SAP Message 56438 - You have entered more than 3 meals receipts for &

Diagnosis
You have entered more than 3 meals receipts for one day. Normally,
there is only one receipt for each meal (breakfast, lunnch, dinner).
Please remember that, when the reimbursement amount is determined,
for each receipt one third of the cost of living savings is deductedfrom the total amount for all receipts of the day.

Procedure
This is an indication that the entry could be incorrect.