This function returns the value associated with the cause or source of the commodity message 'cxm'. Values are provided by the application when a sender or custom object is created.
INPUTS
cxm
the commodity message to inquire about (must NOT be NULL)
RESULT
id
if not specified by the application, the ID value of a commodity message will be 0. It is suggested that using non-zero values in your program as a rule may identify some possible errors.