Editable grid column is showing values but not saving them

Dear all,

I have an invoice style editable grid with item, cost, qty, total etc

I can add and remove items alright and everything is working as should, however, the total column displays values but values in the total column are not getting saved into the CDT.  I have pasted the SAIL code below so perhaps someone can find where the issue might be.  If you can, please advise.

Thanks

a!gridLayout(

totalCount: count(ri!requisitionItems),
headerCells: {
a!gridLayoutHeaderCell(label: "Item" ),
a!gridLayoutHeaderCell(label: "Cost" ),
a!gridLayoutHeaderCell(label: "Qty" ),
a!gridLayoutHeaderCell(label: "Total", align: "RIGHT" ),
/* "Remove" column */
a!gridLayoutHeaderCell(label: "" )
},
/* sizing */
columnConfigs: {
a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight:3 ),
a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight:3 ),
a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight:3 ),
a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight:3 ),
a!gridLayoutColumnConfig(width: "ICON")
},

rows: a!forEach(
items: ri!requisitionItems,
expression: a!gridRowLayout(
id: fv!index,
contents: {
/* Item Column*/
a!textField(
label: "Item " & fv!index,
value: fv!item.description,
saveInto: fv!item.description,
required: true
),
/* Cost Column*/
a!floatingPointField(
label: "Cost" & fv!index,
value: fv!item.cost,
saveInto: fv!item.cost,
required:true
),
/* Quantity Column*/
a!integerField(
label: "assignor " & fv!index,
value: fv!item.qty,
saveInto: fv!item.qty,
required:true
),
/* Total Column*/
a!floatingPointField(
label: "Total " & fv!index,
value: if(
or(isnull(fv!item.qty), isnull(fv!item.cost)),
0,
tointeger(fv!item.qty) * todecimal(fv!item.cost)
),
saveInto: fv!item.total,
readOnly: true,
align: "RIGHT"
),

/* Removal Column*/
a!imageField(
label: "delete " & fv!index,
images: a!documentImage(
document: a!iconIndicator("REMOVE"),
altText: "Remove Line Item",
caption: "Remove " & fv!item.description,
link: a!dynamicLink(
value: fv!index,
saveInto: {
a!save(ri!requisitionItems, remove(ri!requisitionItems, save!value))
}
)
),
size: "ICON"
)
}
)
),
addRowlink: a!dynamicLink(
label: "Add Line Item",

value: {
description: ""

},
saveInto: {
a!save(ri!requisitionItems, append(ri!requisitionItems, save!value))
}
),
validations: {
if(
or(isnull(ri!requisitionItems), count(ri!requisitionItems) < 1),
"Please add at least one line item.",
null
)
},
rowHeader: 1
)