There is one issue w.r.to data model definition of sncPartnerName attribute with in the sapcoreconfiguraiton extension.
This exists in both hybris 5.4 and 5.5 versions.
Issue: we have extra white space in the attribute definition of sncPartnerName, because of this update from second time on wards keep on failing.
to fix the issue, we have to remove the extra white i.e. present in the sncPartnerName attribute definition with in the sapcoreconfiguration.
<description>SNC Partner Name</description> <persistence type="property"/> </attribute>
Please take care of this issue in the upcoming releases.