Postings for account type M ( posting key 99 ) during the entering invoice.

[IgorP]

Dear experts,

I quite new in FI.

I have the problem that during simulation of incoming invoice I have some value posted with posting key 99 to material account.

Question what is the reason to post to this account? Can I somehow found from where is this difference is coming?

GR for value 21 954,24 EUR

Invoice simulation: Posted to account 307110 - 22024,03 EUR, and difference to material account.

Thank you,