how to Transform to Purchase Order

HI

I execute MRP Reuisitions to -> Purchase Order

but have something wrong

wrong 1:

Net price must be greater than 0

Message no. 06218

Diagnosis

The net price is less than or equal to 0, but the invoice receipt (IR) indicator has been set.

Procedure

If you want to create a purchase order without a value, you must set the IR indicator to " ".

wrong 2:

Material TR-0001 not maintained by Purchasing

Message no. ME046

Diagnosis

The data from the purchasing view is normally necessar.

Procedure

Create the purchasing view in the material master record.

Note

If you receive this message in the case of a quota arrangement for the in-house production of a material, for example, you can ignore it.

i think maybe i create material TR-0001 have wrong, because i have not create Costing view,

but i just want to run MRP process

how can i set or add Costing view??

i enter Tcode:MM02 not see Costing view

sorry, english is not good...hope you understand