in the add to cart buttons behaviors, make sure the shipping column is bound to the ProductShipping column of the recordset
also, the shipping rule is not defined as I described earlier. th shipping rule should be set up as:
triggers:
"Subtotal for any column"
if the subtotal for column "totalShipping" is ">" a value of "0"
AND
"Subtotal for any column"
if the subtotal for column "totalShipping" is "<" a value of "50"
calculation:
"Based on Multiple of Column subtotal"
subtotal of column "totalShipping" times "1" "plus" "0"