Hi,
Actually that was what confirmation I was looking for:
Instantiate /SCMTMS/TOR for the FO ID. And then drill down to node = ITEM_TR_TRQ_ITEM
Here, check if BASE_BTD_ID and ORIG_BTD_ID are populated. The TCO field refers to whether it is a STO / SO or Delivery etc.
If above is the case then BTD ID is mandatory for making use of additional tracking ID.
Gopi-Can you kindly confirm since you had informed that just adding parameters would be sufficient but logically unless BTD ID are populated in FO/FB the TM document extraction process would be not able to identify the corresponding ECC document No. I hope you agree with that.