Advances in travel management

Hallo,

I'm customizning FI-TV, where employees are threated asw vendors. I don't know how to post advances to vendors G/L account. This G/L account is locked for direct entries, so I need to post to vendor. I tried in operatation HRP enty *KP for advances symbolic account, but system requires, symbolic account entry in T030 KONTS. (=e.g. HRT G/L account assignment) But I can't do that.

Sumarisation: How can I assign advances symbolic account to vendor????

Thank you in advance 😊

Kind regards

Rado