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When creating a lookup column in SharePoint 2007 the user interface restricts the available columns to a subset of all columns in the list. How does SharePoint decide which columns are available?

The accepted answer to this question: Lookup from list column?Lookup from list column? states that it is only text columns, but that answer is only partially correct as the available selections include the non-text field ID (type Counter), as well as the "Title (linked to item)" option.

Does it add the ID and LinkTitle fields just because it knows they're special?

When creating a lookup column in SharePoint 2007 the user interface restricts the available columns to a subset of all columns in the list. How does SharePoint decide which columns are available?

The accepted answer to this question: Lookup from list column? states that it is only text columns, but that answer is only partially correct as the available selections include the non-text field ID (type Counter), as well as the "Title (linked to item)" option.

Does it add the ID and LinkTitle fields just because it knows they're special?

When creating a lookup column in SharePoint 2007 the user interface restricts the available columns to a subset of all columns in the list. How does SharePoint decide which columns are available?

The accepted answer to this question: Lookup from list column? states that it is only text columns, but that answer is only partially correct as the available selections include the non-text field ID (type Counter), as well as the "Title (linked to item)" option.

Does it add the ID and LinkTitle fields just because it knows they're special?

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Chloraphil
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How to tell if a column is a valid lookup reference?

When creating a lookup column in SharePoint 2007 the user interface restricts the available columns to a subset of all columns in the list. How does SharePoint decide which columns are available?

The accepted answer to this question: Lookup from list column? states that it is only text columns, but that answer is only partially correct as the available selections include the non-text field ID (type Counter), as well as the "Title (linked to item)" option.

Does it add the ID and LinkTitle fields just because it knows they're special?