title: Looping through portal records to update field in related table
body: <p>in filemaker, i have a purchase order table that has a portal with items listed. i want to update the inventory table with the number of items on order for each item in the portal. i tried using a loop that ends with Go to Portal Row [Select;Next;Exit after last], but the loop continually updates the quantities for each of the items in the portal, rather than updating one and moving to the next. what step am i missing?</p>
  
  <p>Thanks!</p>