Attempting to use current entity but none exists.

Additional Information

Unqualified external entity accessed outside an 'X' rule.
    where X is either EXTERNAL-TEXT-ENTITY or EXTERNAL-TEXT-ENTITY.

Explanation

This error is issued when a function accesses an unqualified entity, notation, or data-attribute, but it turns out the function is not called from an EXTERNAL-TEXT-ENTITY or EXTERNAL-TEXT-ENTITY rule.

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