Grouping specific Materials together when running heuristics.

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Hi,

I'd like to know what options are available to me to for keeping Orders for specific Materials grouped together when running heuristics.

For example, I have three Materials: Material A, Material B and Material C. Now, I want Material C to always be scheduled after Material B, but only if sufficient demand exists for it prior to the next run of Material B.

Maybe this illustration will help explain matters:

Week SKU

1 Material A

2 Material A

3 Material B

4 Material C

5 Material A

6 Material B

7 Material A

8 Material A

9 Material B

10 Material C

11 Material A

12 Material A

13 Material C

So, in week 3, I need to produce Material B, but because Material C is required before I next produce Material B (week 6) and Material C must always follow Material B, a run of Material C is scheduled into week 4.

Is there a strategy I can use that will do this for me? Any pointers welcome.

Thanks,

Matty