PurchLine is linked to DimensionAttributeValueSet using DefaultDimension
DimensionAttributeValueSet is linked to DimensionAttributeValueSetItem table usning RecId
DimensionAttributeValueSetItem table is having field called dispalyValue which will give you the financial Dimension value
e.g.
select * from purchline pl
join DimensionAttributeValueSet davs on pl.DefaultDimension = davs.RECID
join DimensionAttributeValueSetItem davsi on davsi.DimensionAttributeValueSet = davs.RecId
where pl.RECID = 5637145326
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