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See Comparison Type - input Type and Comparison Type - Value Type combinations for the relationship between Draft - Comparison Types and Predetermined valuesValue Types.

There are 8 different value types.

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Each value MUST be a GUID. The GUID is converted into an item ID.

Allows a single predetermined value.

BaseIdFromItemGuid

Each value MUST be a GUID. The GUID is converted into a base ID. A base ID maps directly to a primary key in a table.

Allows a single predetermined value.

MultiItemIdFromItemGuid

Does the same as ItemIdFromItemGuid, except that it can handle 1-many Predetermined values.

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The Predetermined values associated with these value types are simply passed on to the search definition.

Multi, MultiId, and MultiString allows the user to define multiple predetermined values.

String only allows for a single predetermined value.