Correct Inventory Load Errors MAI2120 form shows error messages on Kerbs because their start and end width values are missing.
Kerb start and end width values are set as mandatory in Asset Metamodel form therefore is showing errors when missing.
The kerb widths do not have to be mandatory. This is the default setting but one can uncheck mandatory flag on those attributes in Asset Metamodel form.
If you wish to keep them mandatory please use the values of widths at the beginning and the end of that part of the kerb.