PR is not

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Dear Members,

All the SO's will go through back to back process which will create a PR automatically while doing so its throwing below error

Error: The supplier site isn't valid. It must be an active purchasing or sourcing-only site of the supplier and assigned to the requisitioning BU. If the same site name exists across multiple procurement business units, then either the requisitioning BU supplier site assignment must be unique, or there must be an agreement to determine the supplier and supplier site.The supplier isn't valid. Either it doesn't exist or is inactive. For new suppliers, you must set the new supplier attribute to true.