IF condition in System : Formulae

hello everyone
I am currently learning tally tdl development and I want to understand the basic condition of how IF condition works under system : formale.

For example, I want to make a tdl for narration like

If my narration is empty ($$isempty:$narration) then it will show an error like "no narration is entered'
BUT it will not show the error if that narration contains some words like:
"Cash", "cheque", ""bill"
If these words are available in narration, then is will not show the error, otherwise it will show the error of entering the correct narration.

Or

It can also be done as if #VCHNarration is min :4 then it will show the error
like narration field contains minimum 4 characters then it will not show the error

both options are very helpful for me

thank you so much in advance

my code :

Code:

[#Field: VCH Narration]
    Control : ERROR : @@NARVAL

[System : Formulae]
    ERROR : "ERROR !!"+$$NewLine+$$NewLine+"'' No narration entered ''"
    NARVAL : $$ISEMPTY:$Narration ;not contains "cash"

 

Do it like This

NARVAL: $$IsEmpty:$$Value

 

not working

 

Hello sir

Sir its working, but I want that if narration if empty or does not have specific words like cash or bill then only it will chow the error.
If my narration contains cash or bill then only it will not show this error.

 

NARVAL : $$ISEMPTY:$Narration or $Narration NOT Contains "Cash"

sir like this??