Issue while creating BOM items in PDH Fusion using Import Map

Summary:

I am trying to import the BOM items using the Import map but it is throwing errors as follows.
Please help to fix this.

Item : 000018295(CO001), BomItemType - You can't modify the structure item type attribute of item Entity Object because either there's a structure for the item or item Entity Object is a component of another structure. (EGP-2776120) Details: Delete the structure present for this item and remove this component item from all the structures associated with this item. You can then modify the structure item type attribute.

The Item appears that it already is a main Structure or part of a Structure, so there are some restrictions to certain attributes.