How sap done the updations in Gl a/cs

Good evening,

could any body say,how sap system updates the journal entries relevant to material procurement. I know the entry's with t.event keys. I do'nt know how really up dates it in SAP system.

1) Inventory raw mat a/c dr (BSX)

to G/R, I/R a/c (WRX)

( For Goods receipt)

2) G/R, I/R Cleating a/c dr (WRX)

to Vendor a/c

(For invoce verification)

3) Inventory rawmat consumption a/c dr (GBB,vbr)

to Inventory raw mat a/c (BSX)

(For consumption)

4) Inventory rawmat finished goods a/c dr(GBB,zof)

to increasing/decreasing a/c

(For finished goods receipt)

5) Incresing/decresing a/c dr (GBB,vax)

to inventory finished goods a/c (BSX)

Please correct me if I am wrong and describe me how system updates these entrys.

Thanks in advance,

Regs,

NSB