Context problem with sub-process workflow Siebel operation step

Hi, I have two workflows below:

Main Workflow

Sub-Process Workflow

The business object of both workflow is Order Entry (Sales). The main workflow calls the sub-process workflow by passing the object id. In the subprocess workflow is a query operation step to the BC Order Entry – Line Items (Query) which doesn’t have a link. The step is directly querying a record in the BC without a preceding query step on Order Entry – Orders. However, when running the Sub-process workflow via BS Simulator, it runs perfectly. But when I call it via the main workflow, it freezes on the query step above.