Dear Robin.
When i restart SUM it was starting from the same phase where is stooped and as mentioned - MAIN_SHDIMP/SUBMOD_SHDIMP/SHADOW_IMPORT_INC.As of now i have stopped the process, as per the SAP Note 1738989- the error might be because of bug so i am going to apply the Bundle Patch and restart the process again.
Thanks for your support.
Regards
Mohd Basis