FM error when posting documents in F-51

I got the error mesage no: FICUSTOM100 "Document line item 001 contains no clearing information" while posting transfer document using T.code: F-51

(Document entry)

Dr) 25 Vendor A Cr) 31 Vendor B " Same reconcilation account

Both commitment items are assigned to financial transaction 30

I already solved this kind of error in HR using note 1795561

but there's no info for FI

I used to post this document with same warning in 4.7 but after upgrade ECC 6.0 there's an error which I can't proceed anymore

I think this one is because different policy between 4.7 and ECC 6.0

thanks in advance