Permission Error

Hello every one,

I am new to netsuite development hence I require your help in learning this suite script.

I am writing a user event script which can be executed while submitting an online form. In my script I need to access the item record to do some validations and modifications based on user input.

while running the script I am getting the following error notice.

Permission Violation: You need the 'Lists -> Items' permission to access this page. Please contact your account administrator.

I am able to run the script without any problem from my account. How can I run this script from an online form by passing user credentials?