How do get Request Custom Fields and WorkLogs tables linked? I tried Lookup Column

How do get Request Custom Fields and WorkLogs tables linked? I tried Lookup Column

How do get Request Custom Fields and WorkLogs tables linked? I tried Lookup column on RequestID but it says I cannot add it.

I have a custom field called Request Type in table 'Request Custom Fields'...

See attached. I'm trying to build a report using fields from Request Custom Fields and WorkLogs but not working. The attached screen shot shows the relationship of RequestID on all tables so not sure why it's not working.

Thanks!!!
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