Condition not working

Hi ,

I have a scenario , where if a request is rejected by a user , the same request cannot be delete by the same user who rejected it .

a!buttonWidget(
label: "Delete",
icon: "times",
value: cons!Deleted[2]
saveInto: {ri!buttonAction}
style: "DESTRUCTIVE"

showwhen: and(

ri!readonly = false,

loggedinuser() = ri!maker ---- this is just a rule input with type text

a!isNotnullorempty(ri!rejectedby)

),

disabled: if(

ri!rejectedby = loggedinuser(),

true,

false

),

validate:false

Can anyone please help me with it . Thank you in advance.