Modified UI for: Made PlLineOffsetBelowDikeToeAtPolder, PlLineOffsetBelowDikeTopAtPolder, PlLineOffsetBelowDikeTopAtRiver and PlLineOffsetBelowShoulderBaseInside required in xsd/DamLocation.xsd
Set default 0.0 when not specified in import (proper defaults in next commit)
Related to Issue [
MWDAM-1537]