E9.1 Why P4210 matches Schedule pick and promised delivery date?


Hello all
I'm working with a client where there is highly customized JDE Transportation module, they are using routes for load builds but not really doing a rating, nor transportation lead time calculation; all these come from an external 3PL via EDI.

I noticed when entering a Transfer Order (ST-OTs) the APP P4210 equals the Schedule pick date (SDPDDJ), the Promised delivery Date (SDRSDJ) and the Promised Ship Date (PPDJ), when doing the edit on screen al is okay but after submitting the changes all the date are the same. This is creating issues to the Planners and Shipping personnel.

Does anyone know why the P4210 behaves this way when Transportation is turned on?

I appreciate any input.
JDE E1 9.1