Not sure, which version your system is set for. If it is 300, then have a look at the following note
- Note 17009 - Conditions: Sales deal and promotion are not reset
Even if the system is higher version, ensure that whatever coding is recommended there, it is updated which you can take the confirmation from ABAP team
Your issue would have been clear had you mentioned
- whether the system is integrated with CRM
- are you using standard condition types or customized for Sales Deal
- Is the Condition Class set to "H"
and as much information as you can which will narrow down to the issue. Also you can have a look at the following note:-
- Note 791975 - Sales deal creation with reference not possible
G. Lakshmipathi