Hi De Boer,
if i remember correctly, in consolidation, the system wont create a STR from plant B to Plant A, here you will have tomodify the program to create STR incase of stock availability or non availability while doing ATP check in case of consolidation logic.
while doing ATP Check , the system would propose 31.10 as the confirmed delivery date.
or instead of modifying the program an other easy way is to set up a ZTable , maintain lead time from Plant B to plant A - here in plant B you should maintain a replenishment lead time and call this ZTable while doing ATP Check - this way system would consider the lead time from plant B to A, confirmed delivery date would be 31.10.
hope it helps.