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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Page Scripting error i...
Small and medium business | Business Central, N...
Suggested Answer

Page Scripting error in selecting ItemNo. on custom subpage in BC27

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Posted on by CU12011148-0 10

We are using Page Scripting to build automated tests in Dynamics 365 Business Central (BC27 and BC28).

 

The same Page Script works correctly on standard pages such as Sales Order, but fails on our custom page  specifically when setting Item No. on a lines subpage.

Error:  i.filterAsYouType is not a function


The failure always occurs on a subpage (Part)

 
  •  

    The Item No. is selected from the lookup list


  •  

    Alt+Down or the lookup (…) button is used


  •  

    The value is not typed manually



    •  
Page Script Error.png
Categories:
Dynamics 365 Business Central
I have the same question (0)
  • Suggested answer
    Dhiren Nagar Profile Picture
    Dhiren Nagar 2,898 Super User 2026 Season 1 on at
    Hi,
     
    I've faced similar problem in all the pages where we are looking up a record and selecting it.
    You need to type in the value for these fields, for it to work.
  • Suggested answer
    Assisted by AI
    OussamaSabbouh Profile Picture
    OussamaSabbouh 12,878 Super User 2026 Season 1 on at
    Hello ,
     
     it happens because the Item No. field on your custom lines subpage is not using the standard lookup control. Page Scripting expects a normal TableRelation-based, type-to-filter lookup, but on custom pages this often breaks if the field is bound to a variable, uses custom OnLookup/OnAssistEdit logic, or manually opens a page. The lookup still opens for users, but the web client object doesn’t support filterAsYouType, so the test fails (especially on Parts/subpages). Fix by using a real table field with TableRelation and no custom lookup code, or adjust the script to type the value directly instead of using Alt+Down/ellipsis.
    Regards,
    Oussama 

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