Can I exactly find the root cause of PLSQL Fatal error , howcan I debug this issue i have been stuck here and unable to diagnose the exactproblem from where this error is occurring, I’ve tried many things but all myefforts ended in smoke L
Most probably, if you are trying to convert a string to number or date to character or something else, this type or error you may get.
First try to run your query with parameter (if any) in a sql*plus or any sql tester and use it in reports.
Another issues if you are using formula column and write something above or mismatch declaration or return type, you may get the error.
Hope this helps