problem converting a regular query to parametrized query - vb.net

Question

I came across this old piece of code that looks like this:
Dim sql As String = "exec wa_vterm_Insert_upd_Purchase_Card #merchant_id = '" & db.SqlSafe(sMerchantID) & "'" &
", #reference = '" & db.SqlSafe(reference) & "' " &
", #national_tax = " & nationalTax & " " &
", #customer_vat_number = '" & db.SqlSafe(customerVatNumber) & "' " &
", #discount_amount = " & discountAmount & " " &
", #duty_amount = " & dutyAmount & " " &
", #vat_invoice_number = '" & db.SqlSafe(vatInvoiceNumber) & "' " &
", #vat_tax_amount = " & vatTaxAmount & " " &
", #vat_tax_rate = " & vatTaxRate & " " &
", #destination_country_code = '" & db.SqlSafe(destCountryCode) & "' "
Trace.WriteLine(sql, LogLevel.Debug)
db.ExecuteNonQuery(sql)
I am converting this to parameterized query and I coded this:
Dim cmd As New SqlCommand("wa_vterm_Insert_upd_Purchase_Card", con)
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.Add("#merchant_id", sqlDbType:=SqlDbType.VarChar).Value = sMerchantID
cmd.Parameters.Add("#reference", sqlDbType:=SqlDbType.VarChar).Value = reference
cmd.Parameters.Add("#national_tax", sqlDbType:=SqlDbType.VarChar).Value = nationalTax
cmd.Parameters.Add("#customer_vat_number", sqlDbType:=SqlDbType.VarChar).Value = customerVatNumber
cmd.Parameters.Add("#discount_amount", sqlDbType:=SqlDbType.VarChar).Value = discountAmount
cmd.Parameters.Add("#duty_amount", sqlDbType:=SqlDbType.VarChar).Value = dutyAmount
cmd.Parameters.Add("#vat_invoice_number", sqlDbType:=SqlDbType.VarChar).Value = vatInvoiceNumber
cmd.Parameters.Add(" #vat_tax_amount", sqlDbType:=SqlDbType.Decimal).Value = vatTaxAmount
cmd.Parameters.Add(" #vat_tax_rate", sqlDbType:=SqlDbType.Decimal).Value = vatTaxRate
cmd.Parameters.Add(" #destination_country_code", sqlDbType:=SqlDbType.VarChar).Value = destCountryCode
Try
cmd.Connection.Open()
cmd.ExecuteNonQuery()
Catch ex As Exception
Trace.WriteLine(ex.Message & ex.Source, LogLevel.Debug)
Finally
cmd.Connection.Close()
End Try
however with the new piece of code I am getting this exception:
"Procedure or function 'wa_vterm_Insert_upd_Purchase_Card' expects parameter '#vat_tax_amount', which was not supplied."
I don't understand why??

Answer 1

As per the suggestion above the answer was a space in front of the #var_tax_amount