To change Char Value Results with Digital Signature in Result Recording

Dear Experts,

I am having one requirement from the Business ,

They have implemented Digital/Electronic Signature during Result Recording .

Now they are asking if after results have been recorded

Eg :- Char Value -- Assay Value 98 recorder , Digital signature done on Result Recording

Now the user wants the value to Characteristics Assay Value to be changed from 98 to 102 .

The system wont allow , since it is having digital signature done on Result Recording .

Is their any ways / options to change the char value even after electronic signature has been done ??

Regard's

Tallha