Getting value from Function stored in a schema and Watching the value of objects

hi
i'd like to display a labelA which is from a query -> (SELECT NAME FROM TABLE1 WHERE NAME = GetA). GetA is a function which I created in SchemaA. GetA returns a varchar2. In this case.. how can i do that ?
should i write the PL/SQL in the format trigger of this labelA ? if yes, then what should i write in the PL/SQL format trigger ? or should i create another query in Data Model ?
And how do get hold of this labelA's value(or the result returned by the query) in the parameter form?
And lastly is there a way to trace the value of some report objects ?
should i use SRW.MESSAGE ? to print out the 'watched' value ? or any other alternatives ?
what is the url that takes me to learn all these ?
I got this error "REP-1401: 'beforepform': Fatal PL/SQL error occurred." when i initialize the bind variable to a function (GetA)stored in Schema A ---> :P_A := GetA in the before_parameter_form of report trigger;
anything wrong with the above assignment ?
are there any difference between stored procedure like function, package in the database and those in in PL/SQL Library of report builder ???
null

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Getting value from Function stored in a schema and Watching the value of objects

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