How To Check System Date With Invoice Date

Hello sir,

We want make tdl to check system date and invoice date is same or not at the time of creating sales invoice only to prevent back dated sales voucher entry
the logic is as below

sales invoice mode after entering date call goes to function if dates are equal then it gets to next field else it will shows message and stay in date field

kindly help as we are new

If $$date=$$MachineDate
Else
MSGBOX : "Error!!" : "Check Date"

we have implemented as above but it showing error and how to apply this function to sales voucher only
kindly help

 

[#Field: Plain VCH Date]
Addptionrevent Back dated entry@IsSales

[!Field : Prevent Back dated entry]
Control : SkcTitle : @@SkcVal

[System : Formula]

SkcTitle : "ERROR !!"+$$NewLine+$$NewLine+"System Date Not same with Invoice Date"+$$NewLine+$$NewLine+"Please Check Invoice Date"

SkcVal :$$InCreateMode AND NOT ##VARVchDate=$$MachineDate

 

Dear Expert,

I wish to add a field before "VCH Plain Date". Can any please help me with the name of relevant line? Or can you please suggest which form I have to refer?

 

Thank you Sir,

I was searching in the Line, But it was defined in a different way. So I simply made a find option in Developer!!!!

Sometimes easiest method will be knocking at the last.....