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This macro dynamically sets a form field attribute to 'ReadOnly'. Use this macro only to do it at 'runtime'. Otherwise set this parameter on / off on the form interface. section "Read-Only".

The on/off parameter its optional, used by an ajax event to define if a field is going to be read-only (On) or read-only (Off).

Ex 1: To set a field as read only even when the form is in "Addition mode":
if (sc_btn_new)
{
sc_field_readonly({my_field});
}

Ex. 2: To set a field as read only dynamically use:
sc_field_readonly({my_field});