Purchase requisition &, item, & is blocked by requisitioner

What causes this issue?

You have attempted to convert a purchase requisition item that has been
blocked by a requisitioner.

System Response

The requisition item cannot be converted into a follow-on document.
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In the Enjoy purchase order transaction (ME21N, ME22N), you can put a
corresponding purchase order on hold.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.