Question
Lookup Data page
what happens when parameter is not passed to lookup data page and Pass current parameter page checkbox is checked in pega, what is the behaviour pxCallObjOpen activity in this context ?
I notice you've tagged this as 7.3.1. I don't have one of these readily available, but on Pega 8.4.1 the behavior is as I expect and I would expect it to be the same on 7.3.1.
That is, it attempts to do the Open with an empty key, fail to open an instance and put a message on the Data Page saying "No records were found ..."
This is the same result as if you provided a key which did not identify a record in the lookup class.
If the rule using your Data Page is likely to hand over an empty key or a key that does not find a match, that rule should check whether the Data Page has messages on it (or checks the pyErrorPage embedded page) before proceeding with attempting to use the data. Platform 8.3 introduced a convenient When rule @baseclass.pxDataPageHasErrors which can be used where the Data Page in question is the Step Page. Create something like this if you are on an older version:
