Using shipping points instead of plants in TP/VS

Hi experts,

I've been using shipping points as source locations with outbound deliveries with no problems. Now i started a new TP/VS project using INBOUND deliveries, and all the freight units take "plant" as target location. I know about the customizing to "use the sipping point as source loc." but as it says, it works for source locations. What is the best solution for this, does /SAPAPO/LOCMAP table work, or should i use user exits for optimising/delivery creation in R/3?

Thanks in advance for your consideration.

Regards.