Resources - Date outside of planning period

Hi SAP Experts,

I check my capacity profile of the resource 186WC1 in SAP APO 7.0 system and found out that there are dates which are outside of the planning period (the purple dates). Its factory calendar is US which is up to 2020.

Could you please show me how to extend or modify the planning period in SAP APO system ?

Thank you in advance.

Danny