Question

Check for duplicate tracking numbers when creating the tracking in Deliveries.

Answer 1

Bad request because i add same tracking number for usps and my local post

I bought item and shiped via usps to my country
Detailed tracking in usa will be seen from usps
And once it enter my country, detailed info will be seen from my local post tracking

Comments

I totally agree, I do the same and wish to retain this feature, as is.

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Did you know you can have separate providers on the same delivery? Look for the "partial delivery" option when editing a delivery.