PO is not blocking in SUS

Hi Guru's,

This is High Priority Issue.

Scenario: When vendors are created in ECC are replicated through some program to SUS and creates a Business Partner to that vendor in SUS.

Case1: While creating the PO for that vendor in ECC its get replicated in SUS and mails will triggers to the suppliers who are there in BP and it is                             in success state in SXMB_MONI..

Case2: If that Vendor is not present in SUS it has to block the PO creating in SUS side it will in error state in SXMB_MONI.

Case3: This case is Very important, If you created a vendor and that is not replicated in SUS and this vendor number is similar to the one of the                               BP number in SUS, this is happened unfortunately, Now if you create a PO with this vendor and this PO is passing successfully

                             to SUS. Why it is allowing in SUS side even though that vendor is not present in SUS side.

                             While checking in SXMB_MONI it is showing success message.

                 Here is there any setting to make to stop that PO and in SUS side they are using Proxy to create a PO in SUS and this                          is  Standard Code and unable find through debugging.

Thanks in Advance.

Regards,

Sairama.