How to create a Custom Source in SLA?

 Hi,

I want to know if when a Custom Source is created in SLA and a "PL/SQL Function Name" is entered in the Custom Source definition form is necessary to define the PL/SQL Function Name in another module (example: System Administrator / Application / Functions)???

I have a issue validating Application Accounting Definitions when the Account Derivation Rules have assign Custom Sources. In this case, after the validation the status is Invalid for all the lines of the AAD.

However, if I change the Account Derivation Rules replacing the Value Type field value from "Source" to "Constant" and Validate again the AAD, then I am able to validate the AAD.