BP relationship data inconsistency

Hello,

I am using BP relationship category 'BURC01' Shareholder Relationship.

The relationship category's time constraint value is set to 2(t-cd:buba).

When I insert a BP relation record via PC-UI of which duration is overlapped,

serious data inconsistency occurs without any message.

OSS says the error is unignorable and unperceptible for end-users.

I know unignorable unperceptible error sounds rediculous,

so I keep asking OSS.

Has anybody faced a same/similar problem about BP relationship?

I need to deal with the issue ASAP.

OSS response takes long time, though go live date is coming soon.

Regards,

Fukuhara Yohei