CIN issue

Hi,

Pls explain the process abt a/c determination for service po's (with item catelory & a/c assign) during miro.

For example. I have three plants and same tax codes used for all plants. I have defined in FS00 different G/L number for every plant as per below,

For plant #1 - ESA - 101, ESE - 102, VSE -103

For Plant #2 - ESA- 201, ESE-202, VSE-203

For Plant #3 - ESA- 301, ESE-302, VSE-303

And gl is assigned in OB40 (w/o tax code combination) as,

ESA-301 , ESE - 302 , VSE -303 (ONLY plant#3 g/l a/c s they assigned.)

While doing miro for what ever plant, it's going and set on appropriate plant g/l nbrs based on trns. key. pls tell me how a/c determination process flows automaticaly to the exact plant wise