MPN- selection in PO

Question

Hi,
   We have MPN functionality.
Against the one inventory managed material there are many MPN from differnt vendors.
say our inventory managed material is  X
For vendor V1--  X1
For vendor V2-- X2
For vendor V3--  X3
when I am creating the PO say on vendor V1 for material X, every time I have to do F4 and select the material corresponding to this vendor.
can we achieve this automatically means if I give vendor V1 and material X system should automatically convert by seeing this combination into X1(MPN) in PO.
Also there is no control on selection also. If for vendor V1 I give X3 system accepts - this should not happen.
pl guide.
Regards

Answer 1

If you do the following customizing than you will not have issue
Define manufacturer part profile
Manufacturer part profiles (MPN profiles) allow you to specify for each of your firm’s own materials the conditions under which the MPN material may be used in the procurement process.
Using the MPN profile, you can determine the following, for example:
Whether the MPN material has to be entered in the purchase order.
Whether purchasing info records are created for the firm’s own material or for the MPN materials.
Whether the PO text for the firm’s own material or the one for the MPN material is used.
Whether the MPN material may be changed during the procurement process.
Whether the system is to check the approved manufacturer parts list when an MPN material is entered.
You define the MPN profiles in Customizing for Purchasing under Material Master.
You enter the MPN profile in the master record for your firm’s own material (Purchasing view).
Create master records for manufacturers and manufacturer plants
If, during the process of procuring materials, you wish to have the option of choosing between several manufacturers of a material, or between several of a certain manufacturer’s plants, you must create separate master records for such manufacturers and for the relevant plants belonging to the latter.
The number of master records you will need to create for manufacturers, manufacturer plants, and vendors, depends on
Whether the vendor is also the manufacturer
Which of the plants belonging to a certain manufacturer you wish to procure materials from
Vendor is not the manufacturer
If the manufacturer is not a vendor (end supplier), you can store the manufacturer data in a manufacturer master record with a minimum of data entry effort. You then assign the account group MNFR to this manufacturer master record. If you wish to store an external ID for the manufacturer, enter it in the control data (External manufacturer field). This identification will appear in the purchase order.
Vendor is also the manufacturer
If the vendor is simultaneously the manufacturer, you can work with vendor master records. You must then ensure that a partner schema that takes the partner role HS into consideration is assigned to the account group of the vendor master record. (In Customizing for Purchasing under Partner Determination ® Partner Settings in Vendor Master Record ® Assign Partner Schemas to Account Groups). The manufacturer plants must then have the partner role HS in the vendor master record.
You wish to procure materials from certain specific manufacturer plants
If the manufacturer has several Manufacturer Plants, you can create a separate manufacturer master record with the account group MNFR for each of them. The manufacturer plants must have the partner role HS (manufacturer plant) in the manufacturer (vendor) master record.
The following graphic shows which partner roles you have to maintain in the master records for the vendor, manufacturer, and manufacturer plant: