How can I select multiple packages when calling func. module ISU_SL_MANUAL_CALL_MPLAN?

Hello.

Currently, I am able to execute the function module ISU_SL_MANUAL_CALL_MPLAN when doing a maintenance plan manual call:

• when it's a single cycle plan and has only one maintenance item and no maintenance strategy
• when it's a strategy plan with a maintenance strategy, and I specify one of the packages

However, when it's a strategy plan with a maintenance strategy with more than one package, and I wish to select more than one, there's no way to do that. I assume it's a limitation with the function module. If so, is there another function module that I can use that will allow me to select multiple packages, or all of them? How can I select two or more, or all of the packages when there are multiple to choose from? I can do this when doing a manual call manually, so how can I do it via a function module call?