Hi Rachid,
Please try followings.
1. Test it on iPhone
2. Use Chrome browser on iPad.
3. Set external breakpoints in your BADI Implementation.
If the BADI is not called, some configuration is related.
If the BADI is called and additional HTML description is available, check the OData response. If the HTML desctiption is missing, further debug is required.
Regards,
Masa / SAP Technology RIG