Ledger Group specific posting exist (When we trying to activate open item management)

Hello All,

To activate open item management, for existing non Open item GL account, we have run program "FAGL_SWITCHTOOPEN",

Then also we are getting the following error message " Ledger Group specific posting exist",For this we have raise the OSS ticket,

What SAP team is telling that for this GL account we have already run the FC valuation, that the reason we can't activate Open item management,

& they are recommended to solve the issue with consultant technically.

So could you please let me know how to resolve this issue.

Thanks,

Vishnu.