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The globally unique identifier (GUID) of the lookup table associated with a custom field.
<Ltuid> StringValue </Ltuid>
A text value of type string is required. The string must be in the form "HHHHHHHH-HHHH-HHHH-HHHH-HHHHHHHHHHHH" where "H" represents a hexadecimal digit between 0 and F.
The following example uses the Ltuid element to specify the GUID of the lookup table defined for a local custom field.
<ExtendedAttribute> <FieldID>188743731</FieldID> <FieldName>Text1</FieldName> <Alias>MyLocalCustomField</Alias> <Ltuid>E8B19FF9-82ED-492C-A524-530640FBF913</Ltuid> <SecondaryPID>255869028</SecondaryPID> <DefaultGuid>0972C697-2DE3-46C5-8841-9CD7209989AE</DefaultGuid> </ExtendedAttribute>