Error when reordering with Printful - Order already exists and cannot be updated [CODE: 1001]

[MilpaliSwim]

Hi,

When arranging a return, I get this error:
Request declined (2)
Reason
Order already exists and cannot be updated [CODE: 1001]

Printful does not allow to generate another order with the same number, Shopify should create a new order number. How can this be fixed?

Thank you

Charlotte