series 90-30 to RX3i

hi there! i would like to ask again about another concern. i am just confused... i have just migrated a series 90-30 plc into a RX3i and this is how i've done it:
1. imported the program from LM90 to proficy 7.0 sim 15
2. migrated the plc family
3. configured the hardware
4. put the corresponding IP addresses
5. edited some of the ladder due to errors shown by the toolbox after the migration of the ladder logic
6. changed the sys id and task id of the comm_req block

we are now in the process of testing. and somehow the system is not working the way it has to. now, my suspect is the task id in the comm_req block. up until now we haven't tried the testing because of limited time and schedule given to us. my question is... did i forgot something to do or steps in the migration process? if "yes", then what is it? and i would appreciate if you can recommend necessary tests to ensure that communication is working. thank you!