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Referring to the chainage location set can only be done in combination with <readWriteMode>read only</readWriteMode> by configuring <chainageLocationSetId> in <timeSeriesSet>, which is shown at the display groups page:
https://publicwiki.deltares.nl/display/FEWSDOC/02+LocationSets#id-02LocationSets-chainageLocationAttributeIdDisplay groups chainage location set
description
Optional description of the location set. Used for reference purposes only.
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