Hi Karthi,
Is this the first attempt at transferring an IBD, or is an exceptional failure (for example, 1000 other IBDs transferred ok, but this one failed)?
From what you have said, it seems that the transfer is needed for Transit and/or Import Declaration after GR, so interface /SAPSLL/API_6800_TIBD_SYNC should be used. In that case, the Delivery Type must be configured to transfer for Customs Management, and the Foreign Trade data in the Delivery header must include a Preliminary Document number with a Type that has been mapped in GTS as "duty unpaid".
Hope that helps.
Regards,
Dave