Delete Data in Standard Table LIKP

Dear Sir/Madam

I want to know that I can delete data in Standard Table LIKP [Return Delivery which is already Post Good Reciept but does not reference to create Billing]. Then I have some question about this process.

1. Can I delete data in Standard LIKP

2. If, I can what is the follow effect.

3. If I delete data in LIKP and how about data in LIPS.