Source Attribute Value in PersonAccrualDetail HDL File Load

Summary:

We are trying to upload the absence plan accrual details of employees by populating the Source attribute value as custom value 'Test', the load is successful but the underlying backend table has the value loaded as 'DL' for this attribute.

Can someone help in understanding how to populate this value with the custom value? Below is the sample HDL data used.

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METADATA|PersonAccrualDetail|PersonNumber|WorkTermsNumber|PlanName|AccrualType|ProcdDate|Value|SourceSystemId|AdjustmentReason|Source|ExpDt|ElectedAmt|ElectionDt|SourceSystemOwner