brotherton-erpnext/docs/dev/custom_script_examples/docs.dev.custom_script.validate3.md

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---
{
"_label": "Restrict Cancel Rights based on Certain Order Value"
}
---
Add a handler to `custom_before_cancel` event:
cur_frm.cscript.custom_before_cancel = function(doc) {
if (user_roles.indexOf("Accounts User")!=-1 && user_roles.indexOf("Accounts Manager")==-1
&& user_roles.indexOf("System Manager")==-1) {
if (flt(doc.grand_total) > 10000) {
msgprint("You can not cancel this transaction, because grand total \
is greater than 10000");
validated = false;
}
}
}