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PLS-00487: Invalid reference to variable "string"
Cause: A variable was referenced in a way that is inconsistent with its datatype. For example, a scalar variable might have been mistakenly referenced as a record, as follows: DECLARE CURSOR emp_cur IS SELECT empno, ename, sal FROM emp; emp_rec emp_cur%ROWTYPE; my_sal NUMBER(7,2); BEGIN ... total_sal := total_sal + my_sal.sal; -- invalid ...
Action: Check the spelling of the variable name. Make sure the variable was declared properly and that the declaration and reference are consistent regarding datatype.
Most probably the compiler "sees" some other type variable with the same name first which in the other database doesn't exist or is out of scope.