This is the Case statement that I'm using and then having it do a Group Sort.
Formula Name = @GroupSort
Select {@OptSortBy}
Case 1: {SF_ProductionOverview_TTX.Job}
Case 2: {Delivery.Promised_Date}
Case 3: {SF_ProductionOverview_TTX.Customer_PO}
But, the error message indicates the the xxx.customerPO "A Date is Required here
Formula Name = @GroupSort
Select {@OptSortBy}
Case 1: {SF_ProductionOverview_TTX.Job}
Case 2: {Delivery.Promised_Date}
Case 3: {SF_ProductionOverview_TTX.Customer_PO}
But, the error message indicates the the xxx.customerPO "A Date is Required here