Recording Individual Values in ABAP List-Based PI Sheets 
Using field help, you can display information on the format and template of the requested value.
Using the input help, you obtain the following data on separate screens in the following sequence:
– A default value, provided it has been defined in the process instruction
– Allowed values, provided that allowed individual values, value ranges, a value assignment function, or value table have been allocated to the characteristic in Customizing
– Matchcodes, provided that a matchcode object has been assigned to the characteristic in Customizing
Choose Further values to go to the next possible entries screen.
If an input validation is defined for the value, and your entry does not match the validation rule, a corresponding warning is displayed.
– Change to correct the value
– Transfer if you want to use the value nevertheless
If the corresponding setting has been made in the process instruction and control recipe destination, a dialog box for signatures or
digital signatures appears.Do this in exactly the same way as when you complete a process step. Note, however, that data is not reported when you enter a signature in an input validation.
Executing Signature Strategies
The input value is then marked by a special symbol in the PI sheet.

From within the PI sheet, you can display the signatures executed in the PI sheet any time. For more information, see