Debasis,
The first two operations OP2 and OP6 are assembly operations and at FG level they are just maintained as dummy operations with 1 sec machine time to send it to APO.We have assigned the assemblies at OP2 and OP6 so that we receive FG's demand.
We have individual operations at Assembly level with same resource as in FG operations 2 and 6 , so when we receive demand at assembly heuristics will generate planned orders considering assemblies PDS.
I will not speculate upon what bizarre business requirement could have caused someone to pursue this particular solution, but instead I will focus on this question:
We want that OP2 at FG and Operation at assembly 1 should start at same time .
I believe this can be satisfied using Continuous I/O functionality in ECC and SCM. Follow the instructions in the SAP online help link provided earlier. Create and use a Distribution Key similar to the SAP standard GLEI for the plants in scope. In SCM use the heuristic mentioned in the link.
Best Regards,
DB49