New rule validation in v19 seems to overdo it
In v19 of the configuration tools, if you use two rules with the same LHS measure although one is modified with the .master suffix, it now generates an error. This used to work just fine in v18 and earlier versions.
It is quite usual that you would put the commit rules in the rule group which does approval or publish. Or sometimes you are calculating a measure only in the commit rule, before committing it.
After opening my configuration in v19, almost all my commit rules and all the approve/publish rules that include a commit of the populated measures are now flagged as invalid. This is not good as it will hide any true errors that get detected by the configtools in any of those rule groups.