In the ADC XML Specification, the value for LabelNumPrimary and LabelNumSecondary is noted as having to be between 1 to 999999 - 0 is not a valid value, and will cause errors during an XML import if a 0 value is in the XML. Request is to have this modified to accept a 0 value, and the 0 value should be seen as a command to clear any existing label format and use the scale default.
This will not be implemented as this only applies to legacy xml support and that is end of life.