261E movement type to be allowed during GI of Process Order

Dear Collegues,

We are trying for a scenario, Where From Sales Order to Process Order directly to be made.

Now the default movement type for GI of the order is coming 261 E . But system is not allowing with this movement & also this movement is not coming in dropdown. How it is to be mapped , please co-operate.

Best Regards

Aniruddha Biswas