Hi Ratnakar,
You are sending only two parameter values so it updates first two on SAP EM info table.
You have done custom extraction to update in SAP ECC side, however SAP EM was updated previously with A, B, C and D and total four parameter values and indexed.
You can achieve this easily in SAP EM through ruleset by implementing custom activity function.
Check these activity method CHECK/SET_PARAM_VALS and activity function 510_PARAM_UPDATE.
How to implement?
1. Define ruleset to check for event code if it is specific to event.
2. Write custom function to delete and recreate every time for that info parameter.
Check and let me know.
Regards
GGOPII