Hello Zain,
the transaction you are using corresponds to the IMG setting in
Treasury and Risk Management
Transaction Manager
Securities
Transaction Management
Correspondence
-> Define Correspondence Activities,
so this is in fact the customizing for securities.
Please see
Treasury and Risk Management
Transaction Manager
Money Market
Transaction Management
Correspondence
-> Define Correspondence Activities
for the money market settings as product type 51a rather belongs there.
Hope that's it.
Best regards,
Marie
SAP TRM