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Hello @_lukas_,
I always look how out-of-the-box fields are done. Your example is exactly the same as country field in nms:recipient. Except that the state link (conditional select based on previous selection) in your case is not needed.
See the schema nms:recipient
<element externalJoin="true" label="Country/Region" name="country" revIntegrity="normal"
revLink="recipient" target="nms:country" type="link">
<join xpath-dst="@isoA2" xpath-src="location/@countryCode"/>
</element>
<element desc="State/Province" externalJoin="true" label="State" name="stateLink"
revLink="recipient" target="nms:state" type="link">
<join xpath-dst="@code" xpath-src="location/@stateCode"/>
<join xpath-dst="@countryCode" xpath-src="location/@countryCode"/>
</element>See the input form nms:recipient
<input choiceButton="true" createMode="none" extraColumns="@isoA2,@isoA3" noZoom="true"
xpath="../country">
<orderBy>
<node expr="@label"/>
</orderBy>
<enter name="onChange">
<set value="" xpath="../location/@stateCode"/>
<reset xpath="../stateLink"/>
</enter>
</input>
<input choiceButton="true" createMode="none" extraColumns="@code,@countryCode"
noZoom="true" notifyPathList="country/@label|../country/@_cs,@countryCode|../location/@countryCode,country|../country"
xpath="../stateLink">
<sysFilter>
<condition expr="@countryCode = $(../location/@countryCode)"/>
</sysFilter>
<orderBy>
<node expr="@label"/>
</orderBy>
</input>This also applies for all the custom objects you want to create, it is good to look at the ootb objects apart from the documentation
Marcel