need solution for below requiernment

Hi,

Please tell me flow logic for below requiernment:

1. Read actual payroll period from T569V for ABKRS set in infotype 0001

2. Read actual payroll result from cluster RD using german standard functions

3. Loop through table RT and check for wagetype 9000

4. create a batch-input to infotype 0015 wagetype 9000

ANZHL = 1

ZEINH = piece

BEGDA = actual month - 1 (e.g. actual month 06/2008 enter 01.05.2008)

5. allow option for direct or delayed start of batchinput

My confusion is: 1) Why do we need to Read actual payroll period from T569V for ABKRS set in infotype 0001.

2) To update IT 0015 , do we need to write a BDC or we can use FM HR_INFOTYPE_OPERATIONS.

regards