3.3.5.8.2 Sending a RopSynchronizationUploadStateStreamBegin ROP Request
When the RopSynchronizationUploadStateStreamBegin ROP request (section 2.2.3.2.2.1) is sent to the server, no other property upload MUST be in progress for this synchronization context, and any property that is being specified in this ROP SHOULD NOT have been previously uploaded into this synchronization context.
This ROP MUST be followed by the RopSynchronizationUploadStateStreamContinue ROP (section 2.2.3.2.2.2) or the RopSynchronizationUploadStateStreamEnd ROP (section 2.2.3.2.2.3).