Double allocation for sales order

Hiii Experts,

We have manufacturing plant where we are using both make-to-stock and make-to-order strategy to fullfill the local and export demands,now as the plant is using both strategies when we create sales order and run MRP for export purpose we are getting a process order with the sales order refference so that it can confirmed and delivered to fullfil the demdands.

But since there are cases like Ex: assuming having a stock of 100 cases already available to fulfil the requirement of customer order the distrubution assign these stocks to sales order as there is no differnce in the product for local and export, through MB1B 412E movement type and delivers.and also as there is no much co-ordination between production and distribution,again the production people confirms these orders generated through MRP which is becoming a double allocation for the single sales order.

Is there any way fullfil these requirement of double allocation,please suggest so that it can be avoided....

Thanks & Regards,

sampath