====Hide the 'Assign Invoice Number' button====
<code>.pagetypeajaxbookedit .b24btn_AssignInvoiveNumber{display:none;}</code>
====Prevent manual entry of charge items ====
<code>.chargenewitemtr input {pointer-events: none;}</code>
====Prevent manual entry of payment items ====
<code>.paymentnewitemtr input {pointer-events: none;}</code>
German control panel: