DimPk is known as Dimension Primary Key. This is a unique primary key that is assigned to Dimensions when they are created. It is a combination of the DimTypeId and the DimId.
DimPk is commonly used to identify which Dimension should be used when checking for members as base members or descendants in a specific Dimension. DimPk is commonly used in the following functions:
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Get Dimension Primary Key of a Specific Dimension
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Example: api.Dimensions.GetDim("UD1DimName").DimPk
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Check if it is a Base Member of a Specific Ancestor
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Example: api.Members.IsBase(dimPk, ancestorMemberId, baseMemberId, dimDisplayOptions)
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Get Base Members of Parent from GetMember
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Example: api.Members.GetBaseMembers(api.Pov.UD1Dim.DimPk, parent.MemberId, Nothing)
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