You will be able to trigger alerts in BPM, with container variable-values defined in ALRTCATDEF, only by checking the dynamic text option in ALRTCATDEF and by defining a simple type variable in the the BPM.
Did you deinfe a Simple Container Variable in your BPM as SXMS_ERROR_CAT and did you initialize the value using a container operation before the Alert Message is triggered in the BPM?
Take a look at Michal's blog . He has used a variable called DOCNUMBER . In a Container Step, he is assigning a value to that DOCNUMBER.
Like wise, you need to define a container elelment in your BPM , initlialize it in your CONTAINSER step and then in the CONTROL step, you can use this varable using & & along with the Dynamic text.
If you want the container elements to be filled by values by default like it happens in normal Alerts , then it cant be done.
All values you want to pass to the Alert has to come from the BPM. Define any container elelment , assign it a value using a container peration and then use it in the control step --> text .
Although you cannot use the container variables while trigerring alerts from the BPM, you can always <b>assign "context objects"</b> to the simple type container element that you have defined in the BPM(to capture the alert being raised). These context objects are actually a way of <b>accessing a particular field of the message.</b> Therefore, you can capture variables like SNDPRN, MESTYP, etc from the payload of an Idoc...for which you would''ve probably used variables like SXMS_FROM_PARTY,SXMS_TO_NAMESPACE, etc. You can even create your own context objects.
For more, go through the following documentation:-
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