The module will display this error when, during a bulk synchronization (via TAB Sync), you attempt to sync a Prestashop product with combinations/variations to an eBay category that does not support them.

Over 90% of eBay categories support variations; however, certain categories (especially those related to motor parts and business/industrial goods) do not allow them.

To know exactly whether a category supports variations, within the CATEGORIES tab the categories that end with an * are the ones where eBay allows the insertion of variations. You can also refer to eBay support or check the documentation in eBay Customer Service.

If you encounter this situation:

RECOMMENDED OPTION: If possible, change the target eBay category of the product to a similar one that supports variations.
This way you can create a single eBay listing with a drop-down menu for selecting the combination, exactly as in Prestashop.

ALTERNATIVE: The module also allows you to publish products in this condition through Standard synchronization (the sync mode that is triggered when saving a product, via the Fast Sync button in the product sheet or via cron synchronization).
In this mode, the product will be “split” into as many eBay listings as there are individual combinations available in Prestashop. The eBay product title will be suffixed with the name of the combination (pay particular attention to this, as eBay’s 80-character title limit could result in duplicate listings; remember that the module allows you to edit the titles for each variant inside the product sheet editor).

Since this publishing mode is NOT supported during bulk sync, updates to listings published this way must always be done via back office or cron.