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Expression.Error: We cannot apply operator & to types Number and Number

I don't understand the root of this Type issue. I have added a custom column to combine two numbers. They are both Type123. I am unsure why the error pops up.

编号数据

自定义列

在此处输入图像描述

Write below expression in custom column

=Number.ToText([Patient Chart Number])&"."&Number.ToText([Visit Number])

This should work.

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