WMS Document shows “Request not sent” with error

Error message: #

Shipment with ID XXXXX already exist

What does this mean? #

The external WMS already has a shipment/order with the same ID.
Web Connect tried to send the document again, but the external system rejected it.

This commonly happens with systems like Sitoo, which do not allow updates to a document after it has been created.

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Why did this happen? #

Most often, this flow has occurred:

1. The order was created in Business Central and successfully sent to the WMS
2. The order was changed in Business Central (e.g. quantity, date, lines)
3. Web Connect tried to send the updated order again
4. The WMS rejected it because the shipment already exists

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How do I fix it? #

You need to cancel the existing WMS document first, then resend it.

Steps:

1. Open the document
2. Choose Cancel to Warehouse
   This tells the external system (e.g. Sitoo) to cancel the existing shipment

3. Verify that Last WMS Status = Cancelled

4. Click Send to Warehouse to send the document again
   Now the document will be created correctly in the external system

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Does this only apply to Purchase Orders? #

No.
The same issue can occur for any document that creates a shipment, for example:

• Purchase Orders
• Sales Orders
• Transfer Orders
• Return Orders

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How can this be avoided? #

• Avoid changing documents after they have been sent to the WMS
• If changes are required, always cancel the WMS document first
• Then resend the updated document