UPS Delivery with Return – Only Return Labels Printing, Outbound Labels Not Printing

Problem: During a UPS delivery with return, only the return labels are being printed, and the outbound labels are not generated.

Root Cause:
Upon validating the logs shared on the previous day, it was observed that the UPS carrier was returning the same waybill number (1ZXXXXXXXXXXXXXXXX) for both the outbound and return shipments in the TEST environment.

Since ShipConsole web services save labels based on tracking numbers, the return label with tracking number 1ZXXXXXXXXXXXXXXXX overwrote the previously generated outbound label. This issue appears to be an intermittent response from the UPS carrier and is the reason why only the return label is being printed while the outbound label is missing.

Solution:
This behavior is due to a conflict caused by duplicate tracking numbers in the UPS TEST environment. Please ensure that the carrier returns unique waybill numbers for outbound and return shipments. If the issue persists, consider engaging with UPS support to resolve inconsistencies in the tracking number responses