Don't understand setting field by scripts

Hello!

I have a custom action that launches the script:

Блокировать SIM

The script is simple:

void terminals.blockSimDialog(terminals t)

{

s = SIMs [terminal == t.ID];

s.blocked = true;

}

It's catch the sim-card and set a flag in "blocked" field.

It's working - i can see, that flag is set.

Then i have a handler in SIMs form, on Update the "blocked" field:

if (input.blocked)

{

sendmail

(

To : "ulia.sivridi@gmail.com"

From : zoho.adminuserid

Subject : "Block the sim!"

Message : "id number blablabla..."

)

}

But the letter was not sent, and there is no error message.

If i setting field by the hand - i'm get a letter.

Should field's "on Update" respond to the installation by script? I'm need it for bulk operation.