Scenario is

We can manufacture X item 1000 qty. in a week. Sales order comes for 5000 qty at the staring of the week & we have to deliver 5000 qty. in the same week. how this will be maped in the system using MPS.(Only by inhouse production)

can anybody suggest for the same.

Thanks

MPS is a typical LONG term planning and is to be used for items with critical materials and/or critical capacities.
A demand coming in at the beginning of the (this?) week sounds more like short term planning....so MRP. (in both cases you're a bit late with production :D )
When demand is hard to forecast, you would need safetystock (in both MPS and MRP)

But in general MPS shifts the demand to the end of a timebucket and plans receipts at the beginning of the bucket. The long term planning would plan the receipt of 5000 relative to the bucketlength. Weekly periods would result in 5 weeks with 1000 per week, Monthly buckets in 1000 and 4000. (there is a lot more going on, like timefences and so, but then again, in this case MPS doesn't sound like the proper method)