Steve, check out this thread Procedure params missing when importing APP into solution from APV - #4 by steve
Once you have the parameters values set, either by opening the procedure properties or using @Mark_Sarson’s tool, save the APP to APV and then it should be good from that point forward.
This is related to an issue caused when SV moved the prototype parameter information from a template symbol to an actual part of the module definition.
I have to admit I didn’t update my tool to take care of this problem. I can still make that change. Basically looking for no PARAMETER entry but there is a %ProcedureParameters entry and moving the value from one to the other.