Post GATP unconfirmed TAN line only.

Hi All,

Issue:

After Availability check happened through GATP (RBA) the sales order line item in ECC with item category TAN is only remaining in Sales Order.

The line item is unconfirmed with 0 quantity, though sufficient stock is available in both ECC and APO system.

Observations:

Same issue replication is not happening in our quality system (with same settings as in production)

In Production, the issue does not happen all the time.

Kindly help me understand the possible reasons and appropriate solution (if any), for above issue.

Note: Let me know if more info required.