Hi Cat,
The concept is do not change the current access sequence. The current one is ZAC1 without the new tables.
In free goods, ZAC1 is assigned to the free goods condition type and free goods functionality works just fine.
New requirement is to add few more tables. For this create new table ZAC2 (with all the tables - new and old). (first unassign ZAC1) Assign the free goods condition type with ZAC2.
During testing you see that the desire result is not achieve by this new configuration (i.e. access sequence) or after taking this change to PRD - business wants to revert this change. In that case, earlier access sequence is untouched ZAC1.
Simply, you have to unassign ZAC2 and reassign ZAC1 to the condition type; and things go back to old setup.
Therefore do not change ZAC1 instead create new access sequence ZAC2.
I hope my explanation is clear.
Note: This concept / way of working is followed in many changes, where there is an element of "uncertainty or risk"
