Deleting Internal table based on condition

Hi,

I am kinda stuck in the process of Deleting the Internal table which contains many duplicates.

Here is the brief overview of it.

Record: 1,  Vendor Number - 00123456, Invoice Number-ABCD, Invoice Amount -$20,000, Invoice Date-12/15/2015 DTYPI: X

Record:2.  Vendor Number - 00123456, Invoice Number-ABCD, Invoice Amount -$20,000, Invoice Date-12/15/2015 DTYPC: X

Record:3. Vendor Number - 00123456, Invoice Number-ABCD, Invoice Amount -$20,000, Invoice Date-12/15/2015

$20,000 - $20,000 + $20,000 = $20,000 Invoice posted

Here Internal table is having 3 records. Record 1,2 and 3.

All 3 records having same entries, but record 1 is having DTYPI and record 2 is having DTYPC.

I need to delete record 1 and record 2 comparing vendor Number, invoice number, invoice amount and invoice date are same and if record 1 having DTYPI = X and record 2 is having DTYPC = 'X',  then Record 1 and record 2 need to be delete from internal table and an internal table should have Record 3 only.

I did so many loops and couldn`t able to achieve it.

Please give me an idea about this.

BR,

EH