QueueSubmitTimesheet and Approver

I read a TimeSheet from the PSDB via the PSI Service References.  The TimeSheet contains 2 Projects, each with a different PM (Approver). 

How would I get the 2 Projects to be Approved by their appropriate PM Approver with only 1 TimeSheet UID and this function definition?  Do I call it twice and assume it will figure out by ApproverUID and the Project Enterprise Owner which Projects inside the TimeSheet I am submitting?

public void QueueSubmitTimesheet(
	Guid jobUID,
	Guid tsUID,
	Guid approverUID,
	string comment
)