Re: MPS

Wait a minute, Myron ... are we talking about the same planning start date
here?  Mac and I are referring to MRP120, which is the planning start date
for the MRP time frame.  There is also a planning start date in SYS190,
which appears and is normally updated when you run MRP500 and MRP600 ...
those dates we change every day, for the very reasons you mention, and
never have any of the problems you mention.

My in-house BPCS planning expert (who is an ex-SSA implementation
specialist) tells me that on some older versions of BPCS you didn't have
the facility specific planning start date, and you did have to do some
frequent changes to the MRP120 planning start date (which might be why you
do it, Mac, as I think you've told me you were on some older versions at
one point).

Lisa



                                                                                
          
                    Ncsmhamilt@AOL.                                             
          
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                    owner-bpcs-l@mi        Subject:     Re: MPS                 
          
                    drange.com                                                  
          
                                                                                
          
                                                                                
          
                    07/19/2001                                                  
          
                    03:58 PM                                                    
          
                    Please respond                                              
          
                    to BPCS-L                                                   
          
                                                                                
          
                                                                                
          




Lisa,

The reason that we consultants suggest that you change the planning start
date each week are as follows:

When MRP creates planned orders, they are created no earlier that the
planning start date plus the horizon days/periods.  This prevents MRP/MPS
from creating planned orders that should have been completed before today.
In a true MPS environment, where your MPS is frozen, you would not want the
system to create orders within your master schedule (which would be your
horizon length).  Then the master scheduler can decide what to do with
them.

Secondly, the demand time fence is based on the planning start date.  This
time fence determines when you switch from considering orders to forecast
based on your settings.

So if you are not concerned about these two things, there is no real need
to
change the planning start date each week.

Myron Hamilton
New Century Technology



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