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I'm using QGIS 2.14. I have a field defined as a value relation (widget). I would like to show the value in the linked "value column" as a label in the map in stead of the value of the "key column". Is there a way to achieve this?

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I found the answer myself. This should be the label-expression:

attribute(get_feature('VALUE_LAYER_NAME', 'KEY_FIELD', KEY), 'VALUE_FIELD')

VALUE_LAYER_NAME: the name of the layer having the value column (the linked layer)

KEY_FIELD: the name of the key column in the VALUE_LAYER_NAME

KEY: the name of the field in the layer you are labeling (the one with the value relation defined)

VALUE_FIELD: the name of the value column in the VALUE_LAYER_NAME

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