dimension Transaction date - fiscal calendar was not found in the cube Error ?

Hi, we are on AX 2012 R2 with CU7. when i try to run the Report "Top Vendors by YTD purchases" i get this error:

Query (12, 2) The dimension '[Transaction date - fiscal calendar]' was not found in the cube when the string, [Transaction date - fiscal calendar].[Year].[All], was parsed.

i am very new to SSAS, any help here would be great.

Thanks,

San