I'd say you have too many negations there

try following

IamanInventor  &&  (!startsWith(SignedByField,'/') || !endsWith(SignedByField,'/'))

as well in your second formula, not(not()) - one negates with the other, so none is needed.

Hi Marian,

Thank you for your prompt response.

I tried this validation rule... no luck.

is there any other way ( I mean javascript?) to make this requirement work?

Please let me know!!!

Thanks in Advance!

HI Marian Hatala‌

You are right there are too many negotiations  in the validation rule I used.

Trial and error method worked for me

I used this rule and it started working magically.

IamanInventor && (or(!startsWith(SignedByField,'/'), !endsWith(SignedByField,'/')))

I deleted the mandatory rule that I used for this field not(not(IamanInventor)) && isNullOrEmpty({Self}) ( The syntax rule itself works as mandatory rule ( How silly I was!!))

Thanks a ton for your help , I really appreciate it!!

Thanks!!!

great.

your final formula is logically just the same as the one I suggested. you likely made some (small) typo/mistake, I'm quite sure it should work

Dear ‌

Now I am facing another problem with the validation rule I am using

it doesn't work on edit.
I am using the formula below.

Is Edit Mode  && (or((!startsWith(SignedByField,'/'), !endsWith(SignedByField,'/'))

I have no idea how to resolve this.

any inputs?

Thanks!!