3801162 - IBP: Location Product substitution not working for different locations

A Location Product substitution has been set for different locations, for example:
Leading:
Product A
Location X

Substitute
Product B
Location Y

But after planning run (finite heuristic or optimizer) the substitution does not take place.

•    SAP Supply Chain Management (SCM)
•    SAP Integrated Business Planning (SCM-IBP)

Interchangeability, subs, shortage, same location, FH, OPT, OBP,   HARDSTOP, SOFTSTOP, PROMOTION, SUBSTITUTION , KBA , SCM-IBP-RM-PLG , Planning , SCM-IBP-RM-OPT , Order-Based Optimizer , SCM-IBP-RM-FH , Order-Based Finite Heuristic , Problem