MRP & schedule margin key issue

Hi All,
My client is running MRP on daily basis they have maintained schedule margin key 001 with opening period as 0010.but while running MRP & MD04 they
found below are the issues.
We have tested many times using SMK as 000 & 0010 but every time system displayed below errors.
Some times they are not getting the purchase requisition created in time (System should drop the purchase Requisitions according to parameters maintained in material master).
Some time system creates planned order instead of Purchase Requisition (Their requirement is to create purchase requisition always)
They get the exception message past due planned order
As per my understanding there will be problem in buffer period.How can we avoid these exception messages & how can we create always PR instead of pl order.
I will appericate if anybody suggest me how can we rectify above mentioned causes.
Thanks,
Ravindra.

Hi Caetano /Ram
Thank you for replies.I have following doubts on your reply
I understood if I create Variant including only PR system will display always PR in MD04.
1.If I run MRP using option 2 PR in opening period in this case system behave like same or do I need to include this parameter in variant
2.How can I avoid exception message"Past open due" for Ex :- 10,20,30 etc... permentaly in MRP run?
I have not tested solution yet I hope if I create MRP group & during background MRP run if I create variant with parameter 1 (PR only) it will create PR.
Can you pls assist on SMK? For your clarification check below is my actual scenario
if I assigned SMK with 000 (All periods like opening period,FAP,FBP & release period is 000) then what happen in MRP run if I made your suggested setting is system means it will always create PR.
If I assigned SMK with 001(opening period 0010,FBP 5,FAP 2 ,release period =5) also
if I maintained GR time= 2 days,
Pl.delivery time =10 days in this case will above setting work? if i run MPR using opening Period as well as PR only.
Kindly correct me if i am wrong.
Thanks,
Ravindra

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MRP & schedule margin key issue

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