How to make working hours not required on assignment?

Summary: On certain redwood employment transactions we get an error for missing working hours. Due to the nature of our business we do not track standard working hours for most of our population. Many assignments have a blank value but the frequency is defaulting as weekly. I cannot turn off the requirement in VBCS. Is there a way to make the working hours field not required? If not we may be forced to update several thousand assignment records.

Can this error be changed to a warning message instead?

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Version (include the version you are using, if applicable): 25A