A related items control dosn't work correctly.

My name is Yoshiki-Tojo from Japan .

Managing Director of Tojo Management Science Laboratory Co.Ltd in Tokyo, Japan .

Now I am developping an application in Access Web 2013 under SharePointServer on premises .

Similar status happend in Office 365 .

I wanted to develop a related items control , and select it on upper screen.

Really , a related items control was added to lower screen .

So, I pushed + button to add a new tab . A pop-up screen was dsiplayed , and prompted to input two fields .

However , even though I provided two fields , any tabs never be added .

I thought that a related items control didn't work correctly .

Please , let me know how to solve it .

Thanks.

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Best Regards from Japan .