Ex Secure Field : block change of MBSSQT for everyone except 3 users.
Step 1 : SES100 creation of a secure field group STKSECU set in display
SES102 : select the field to secure
Step 2: SES010 Add specific access for the 3 users (editable) + add a specific control (not display) to me for test
Step 3 : SES200 add STKSECU security to the field.