Get last Injury date at Bex from infocube

Hi

I have calculate no of days = sy-datum- last injurt date at bex .

In cube I am getting Iast injurt date at company code level. But at bex i wnat to use last injurt date. I am not using any key figures here?

example

comp code  last injurt

1000    20th jan

1000  23rd jan

In bex  no of days = 30th jan ( sy-date) - 23rd jan

please let me know what is best possible solution?