system warning : "erro when caculating backward...&quot

huanpt
huanpt Member Posts: 11
edited 2006-08-10 in NAV/Navision Classic Client
Hi all,

Could you kindly answer me a trouble.

I run calculating (both net change and regenerate) in planing worksheets but the system warning: "erro when caculating backward. Calendar are not available before dd/mm/yyyy for Work center xxxx"

What is mean of this message?

What is wrong i made before. I dont understand.

Pls reply to me soon.

Thank you very much!

Comments

  • mbskapil
    mbskapil Member Posts: 43
    Dear huanpt

    It could have been some logical error from your side ,before concluding your problem plz tell me if you are on Nav 3.70 or Nav 4.0
  • huanpt
    huanpt Member Posts: 11
    mbskapil wrote:
    Dear huanpt

    It could have been some logical error from your side ,before concluding your problem plz tell me if you are on Nav 3.70 or Nav 4.0


    Dear mbskapil,

    I tried with Nav 3.70

    Thank for your reply.

    Best regard.
  • mbskapil
    mbskapil Member Posts: 43
    Dear huanpt
    It could have been that the order date you are giving is before the current financial year i mean before the date the entries have been started posting in your system .In that case error could have been occoured . If still you get the error the let me know
  • huanpt
    huanpt Member Posts: 11
    To: mbskapil,

    Im not sure know enough about MRP/MPS run process in NAV. I might made some mistake in perform it.

    Could you show me simply about MRP/MPS run process so I can run it well.

    I'v made the Item master and Pro.BOM for my product same "Bicycle" example in demo data.

    Wait reply from you.
  • johnson_alonso
    johnson_alonso Member Posts: 690
    Hi huan, mbskapil,
    sorry to adding answer.
    Check your machine center or work center planning calendar (recalculating it) and then adjust your machine center
    or work center in your routing correctly by checking your operation sequences serial or paralel
    concurrent capacities, capacity and lot size must be match with capacity planning calendar.
    I consider that your production schedule day that you calculate using MRP/MPS (planning worksheet) is not match with your machine center/work center planning calendar. This is caused by inavaialable capacity of your machine or work center in the production schedule day range calculated in the past because backward is the calculation from the due date of production backward to the past of current day. The solution is mentioned above.


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