What's this task

Hi All,

I need to find out which method is calling with     element.task(#post); line. How can I find out what's is the task 263?

#define.post(263)

    MenuItemNameAction callerMenuItem;
    callerMenuItem = purchFormLetter.parmCallerMenuItem();
    isInvoiceSaved =true;
    isInvoicePosting =true;

    element.updateDocFromProforma(callerMenuItem);
    element.task(#post);