Interchangeability and Horizon

Dears,

We have two products in interchangeability group. However, I found the substitution order could only be generated outside the SNP stock transfer horizon of successor even the demand on successor came earlier.

I assume that's how the system works. Because SNP doesn't generate stock transfer within STH. However, don't really agree on that should be the business case. Because for two products on the same location there's no lead time, the substitution should happen regardless STH.

Does anyone know if there's any solution to tackle above?

Thanks!

Tony