Update main workflow container from In-Progress Subworkflow

[Krishna K Kammaje]

Hi,

I have a requirement where I need to update a main workflow container 
element from a sub-workflow, while the sub-workflow is still running. 
(In-Progress)

I have tried using the FM SAP_WAPI_WRITE_CONTAINER in sub-workflow, but it 
returns an error saying "Cannot call WAPI interface 
'SAP_WAPI_WRITE_CONTAINER' in this context".
I have also tried FM SWW_WI_CONTAINER_MODIFY, but it does not update at 
all.
I have also tried triggering an even in sub-workflow, which in turn 
triggers a class method, but it gives an errors saying "WF locked"

Please let me know if you have any other strategies.

Thanks
Krishna Kishor Kammaje 

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