how to disable overriding charge account by buyers in purchase orders

Summary:

We have build TAB rules based on Item categories, But buyers can override the charge account and this category doesn't override the charge account what buyers key in when creating PO, Until they click on rebuild accounts. But doing this process manually for every line is cumbersome is there a way to disabling the override charge account by buyers

Content (required):

We have build TAB rules based on Item categories, But buyers can override the charge account and this category doesn't override the charge account what buyers key in when creating PO, Until they click on rebuild accounts. But doing this process manually for every line is cumbersome is there a way to disabling the override charge account by buyers