Hi Mariano
MRP will correctly consider the requirement date to plan the component on the supplying plant and the requirement date is calculated considering the planned delivery time. Therefore, what you are seeing on your system is correct.
As far as I can see, the only standard solution is to remove the planned delivery time, so that the requirement date is equal to the delivery date.
Alternatively, you can use BAdI MD_STOCK_TRANSFER to manipulate the MRP requirement date on the supplying plant.
Best regards
Caetano Almeida