Issue with Capacity Levelling in SNP

[Former Member]

Hi,

We are using heuristic planning method along with capacity leveling in SNP for one of our clients. Some of the resources have capacity constraints, we are doing capacity leveling at all such resources after running heuristic. They do not want to use Optimizer as they cannot provide the additional master data required for optimizer.  We are facing issues with the planning results after capacity leveling. 

Suppose there are three products A, B & C, where C is an input for B and B is an input for A (A <--- B <--- C) made at Resources R1, R2 & R3 respectively).When we run the Multilevel Heuristic for a demand on product A, we get planned orders for A, as well as dependent demand on B and planned orders for B against the dependent demand.

While doing capacity leveling on resource R2, Planned orders of product B get shifted, the shift is not linked to planned orders of Product A and they remain same which gives the impression that A is available on time.

How can we ensure that any delay in the availability of the component is propagated to the header product.?

                                                                               Product A ---------------------- Product B --------------------- Product C ----------------------

                                                                                                   Resource R1                        Resource R2                       Resource R3  

Regards,

Abhay.                                 

[Former Member · Accepted solution]

Hi,

to my understanding, if you remove SNP optimizer, you are requiring PP/DS functionally (either by heuristics or optimizer). SNP assumes almost by design that you are planning medium-long range in a single key resource and that your main problem is capacity: it helps you to level production by capacity and then assumes you will fix the remaining levels (either upstream or downstream). In other words, it assumes SOMEBODY ELSE will do the work (a user, a macro...). You can of course try to re-run MRP on the Cs level and fix it, but won't work with As.

May be another expert can prove me wrong.

thanks,

J.