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Format of reference document number is invalid Message no. 8A556

Dear Expert,

I have problem while executing transaction Manual Posting incoming invoice with t-code FB60. The error message shown as written above "Format of reference document number is invalid Message no. 8A556"

I have check the customizing on document type and number range, they are all standard SAP, nothing strange as far my concern.

Could any one give any idea on this problem.

Thanks in advance

Irhasni

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