Item type does not allow splitting

Hi SAP Experts;

We have a Delivery Based Transportation Requirement Escenario integrated (DBTR), this means that we are planning from Deliveries created in the ECC side but once this deliveries are in TM the FUBR does not works properly.

This means that if the Delivery (ECC) was created from a SO with 10 pieces and saved, the DBTR in TM generate automatically a FU with 10 pieces despite the FUBR is defined in 5 pieces. (The expected result is to have 2 FU one with 5 pieces and the another one also 5 pieces)

And Manually creation brings an error:

Important to now:

*Item split allowed is checked in FUBR

*Item is the main item (doesnt have subitems)

Thans for your help

Best Regards,

Camilo