Hi Edi,
If you come with some techncial info that would be better to sugegst you.
booking with pricing condition: This is related to Sales billing data sources
You can check data source 2LIS_13_****
http://help.sap.com/saphelp_nw73/helpdata/en/42/9a54a7a7e541b1b5f8036979540339/content.htm
Thanks