Linking to the ledgerfund table from the generaljournalaccountentry table using the financialdimension in the generaljournalaccountentry table as the starting point

Hello.

I am trying to do the primary select in an x++ statement in a class and was told I cannot use the string functions.   The generaljournalaccountentry tables houses the financialdimension (in our case fund.mainaccount.Department is the financial dimension set we use).  The generaljournalaccountentry.financialdimension ==dimensionattributevaluecombination.recid

however I can't get to the ledgerfund  table.

Is there a link that I should be using instead or some suggestions as to how to get the fund number and fundname?