About Configretion

Hi experts,

please tell me about step by step configretion on these three topics:

1.PR Creation date of any item in PO should be =< PO creation date (check while saving the PO in ME21N/ME22N).

2.Delivery date of any line item of PO should be => the PO creation date.

3.Document date of PO should be hide.

please sir solve my these tree problam as sson as possible.

thanking you.

Thanks/

Anurag