Social link not appear in Purchase order or purchase requisition

Summary:

when create new PO or PR or open an existing PO or PR i cant share it in OSN as the link with name "SOCIAL" not exist in Document , please advice?

Content (required):

when create new PO or PR or open an existing PO or PR i cant share it in OSN as the link with name "SOCIAL" not exist in Document , please advice?

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