Extending Seed Table

I am following the documentation list here,

Using seed addresses

Seed addresses

Using seed addresses

but I keep getting this error,

Attribute 'workField' unknown (see definition of element '/custom_nms_recipient' in schema 'Seed addresses (nms:seedMember)').

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XML-110013 Error line 0, column 0 (document with schema 'input')

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The graphical component 'treeEdit0' has generated an error.

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I'm just doing what the doc says. It is also weird that once I update the structure, the nms:SeedMember has not indicated a change to update.

Seems like something is missing.