moving average & stad. price of materials

Dear all

Can anybody explain me the following phenomena. I have 3 materials, X, Y & Z . X is child component of Y and Y is child componenet of Z. I have BOM accordingly. Materials are externally procured. All the materials have V as price indicator.

When I issue the Material Z against 261 movt. type(order) the goods issue is happening at Std. price of the material which is automatically updating it self in material master. I have never updated the std price as i am maintaining V , so the system should have taken the V price as that is what is gettign updated during each GR. But it is only picking STd. price? IN which other activity( movt type) it will pick std price and wher it will pick V., pls. clarify the behaviour.

Regds

Sam