Dysfunction of the central alarm HAM06WS with menu STUDY

Hello , excuse me for my bad english
I have a problem avec my HAM06WS . she 4 years old.
When I am in a menu SYS and I want entry 4 for going in STUDY , I can’t . The menu does not move of SYS. Contrariwise I can going in menu 1 or 2 or 3. What is the problem ? me I think that the memory is full but there are not the fonction’s menu for delete the memory .
Please can help me , because , I can’t programming sensors and remote controls.
Best regards .

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