Debtors error problem

Hi… I made a new Journal Entry for Payment to our Customer “Debtors”, but when I try to Submit the document this error is showing, please check photo.
Please advise the possible cause and solution.
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Please check general ledger report for outstanding amount of the customer. Is it really 519477? Then the validation is correct, you need to increase the credit limit.

Thank you Sir:slightly_smiling_face: