generate account depending on context segment values

Summary:

we have context segment include two values X and Y , we need to generate accounts in PO lines depending on this values , so i created new mapping set in purchasing and when adding a source i found the below two source and i need to know the difference between both ? and which one we should use to achieve our needs ?

XCC_GLOBAL_ATTRIBUTE_CATEGORY

XCC_ATTRIBUTE_CATEGORY

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