Item &3 with item category &4 was not transferred

What causes this issue?

You transferred a material cost estimate without quantity structure in
plant &V2& as a reference and in doing so established that the
itemization contains an item &V3& with item category &V4&. However, it
is not possible to transfer this item to the costing with quantity
structure.

System Response

The item with item category &V4& is not transferred, meaning that not
all of the costs from a cost estimate without quantity structure can be
transferred to a cost estimate with quantity structure. Consequently,
the costs of the cost estimate now created are lower than the total
costs of the cost estimate without quantity structure.
The following item categories are not supported in the cost estimate
with quantity structure:
S for total
T for text item
B for base planning object
O for mathematical operation
Y for customer-specific extension

How to fix this error?

Check to see if you are dealing with the right cost estimate in the
case of the cost estimate to be tranferred.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.