In some models getValidationScript call parent method but does not return anything:
Attachment ,BillLine, CheckListDefinitionLine,CheckListLine,Job,JobDefinition,Note

For Job it may be an issue (I'll have a look and possibily remove it in V6.2, even if I don't think it may generate display issue).
For others, it is not an issue because these items are not displayed on full screen like main objects, and generic getValidationScript (the parent one) is valid only for this purpose.

In some models getValidationScript is redundant (just returns parent method)
BudgetElement, CheckList,ComponentMain,OrganizationMain,ProductMain,ProductOrComponent,StatusMain,TenderStatus,TestCaseMain,VersionProject

This main not link to issue, but it's clear it is not very clean (it msut be some initialization during first dev that was never used).
We'll remove them on V6.2.

in IndicatorDefinition is called twice

This is more serious issue. Will be fixed on patch V6.1.3

Thanks for reporting !