Physical Inventory documents mass delete and reference in material document

Dear Experts,

I have 3 questions,

1. Is there any option to mass delete physical Inv documents

2. How can i know if the physical inventory documents are posted (MI07) or not yet

3. If i see any material document of mov type 701 or 702, there is no reference of physical Inv Doc # in it. How can i know that this material document is created as a result of which physicl Inv document.

Appreciate your help

SAPXPT