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What is PurchIdAdvance means in form PurchTable

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Posted on by 382
Hi,
 
In form PurchTable (Purchase Order form), I found the Purchase Order Number field in the grid is stated as PurchIdAdvance ->
 
While looking at its property, for the data field it self is still PurchId from PurchTable ->
 
May I know what is this means ?
 
My intention is too find out how is this PurchId length become 40 when I checked in SQL.
My understanding is PurchId in table is based of its Extended data type which is in this case is PurchIdBase with string length is 20. Also appeared in PurchTable field PurchId property :
 
Thanks,