Tran_code 15 and Sales_type

Hi,

I am new to ResA. While posting the Tran_data for the sales transaction. I found following Tran_code

Type 1:  Tran_code- 13-Sales_TYPE -> '-1'   Permanent Markdown

Type 2:  Tran_code- 15  -Sales_TYPE -> 'R'   Retail markdown(in store)

Type 3:  Tran_code- 15  -Sales_TYPE -> 'P' Retail  promotion

Type 4:  Tran_code- 15  -Sales_TYPE -> 'C' Clearance

Type 5:  Tran_code- 16  -Sales_TYPE -> '-1' Clearance Markdown

Could you please provide the clarification for the Type 1 and Type 2 and Type 4 and Type 5

Thanks in Advance

Balu S