Suppress Purchase Order Header when Terms & Conditions print

20 pts.
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I have this working using: 
1) This formula in the Header:
WhilePrintingRecords; Global numberVar inc := 0; 

2) Conditional Suppression in the Header Section:
If onlastrecord or onfirstrecord 
or{PO_25CRWPurchaseOrderHeader.PurchaseOrderNumber}<> next({PO_25CRWPurchaseOrderHeader.PurchaseOrderNumber}) then true else false

This works perfectly when I have two or more rows of Detail. However, when there is only one row of detail, it suppresses the Header in error. Any suggestions would be appreciated.

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Correction to how I have set up #2

2) Conditional Suppression in the Header Section:

If onlastrecord or{PO_25CRWPurchaseOrderHeader.PurchaseOrderNumber}<> next({PO_25CRWPurchaseOrderHeader.PurchaseOrderNumber}) then true else false

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