E1 42 P4205 Allows negative on hand in primary UM when ship confirm dual items

Hi experts, hope someone can help me

I am setting up dual items for a customer, but I have the following problem:

The P4205 it allows negative on hand in primary UM when ship confirm sales orders for dual items, the P4205 program checks availability on the secundary UM but not at primary.

Does anyone know if this behavior is normal or how could I solve this?

To set up dual items I have followed recommendations from this documents: E1: 41: Dual Unit of Measure (P4101, P4310, R41411, R41610, R41413) (Doc ID 625673.1),

E1: 31: Dual Units of Measure FAQ (Doc ID 625997.1)

and also the following to avoid negatives