Hi,
When i tried to do the correspondence i got the same error, please check below some config that i did to make this work.
Check t-code and assign the profile bp groups to receipents FTR_EXT_ASSIGN.
> Define Correspondence Activities - Money Market
> Define Communication Profiles
> Define Correspondence Recipient Types
> Define Correspondence Classes
> Define Business Partner Group
> Assign Attributes for Business Partner Groups
Please let me know if this works.
Regards,
JYoti