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In short, enforcing a list relationship behavior helps keep your data valid and helps prevent inconsistencies that might cause problems down the road.
When you create a lookup column in a source list, the primary column displays values from the target list column, but you can also specify that additional, secondary columns from the target list also display alongside the primary column and the other source list columns.The primary column name is a name you provide when you create the lookup column. When you create list relationships by using lookup columns, unique columns, and lists with enforced relationships, you can reach a resource threshold or limit and may be blocked under the following circumstances: Warning: You cannot create a unique column in a list with item-level permissions defined, you cannot break inheritance of permissions from a list to a list item if the list contains a unique column, you cannot create a unique column or modify a column to be unique in a list that contains items with unique permissions or one that has content approval enabled, and you cannot copy a file to a library by using the Open with Explorer command, if that library contains a unique column.By default, each secondary column name follows a standard naming convention of . These steps walk you through setting up a look up column that displays the primary column, and optionally a secondary column into a list.I am doing this, with a hope that you will click on my link.However, the method I am describing is real and you will see screenshots that prove it.