Problem in calling a procedure in form builder

sir
i have developed a procedure in pl\sql libriries but when i call this procedure from trigger compiler can not recognized this procedure.
procedure is: computetotal
libraries name is pl_004
plese help me and give me solution
thanks in advance

It the library is attached, expand the attached library, and try dragging the program unit in question, to local program units of the form and then try to compile the form.
The only cause could be that library is not attached to the form, so give this above method a try to cross-check.

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