RIORVALUE returns the previous value of a field." The validation rule can compare the current value and the prior value of Estimated Hours and display an error message if the current value is greater than the prior value. Creating a formula default value for the custom field, creating a formula field that uses the PREVGROUPVAL function, and creating a validation rule that uses the ISCHANGED function are not valid or correct solutions for this requirement.
ath helps users track record stages, not enforce procedural steps.
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