Trading partner issue

Hi Guru's

when i have tried to clear GL account 556699 (inter company account) is was giving an error saying that consolidated companies are different,

I have checked with OSS note and activate intercompany trading field for documents type in test system and it worked

my query is why it is giving this error now as we used to do beofre without any error.

there are no changes on master data for this cahgnes.

any help from expetrs?

thanks

Sunitha