I'm getting a dal error message: "whinhs7020: order line not found" when i try to add a cost item to sales order line.
Two questions:
1. What's this message mean?
2. Is there a book of definitions of all these dal error messages that i could use to deceiver these cryptic messages?

thanks in advance for any help.

@2 there are thousands of error messages - would be great if all of them are documented in detail.
@1 Each sales order will result in a related warehouse order. Probably something is wrong in the synchronization between the sales order and the warehouse order. If there are no other error message in the stack then probably this can only be analyzed via debugging the scenario.