X-path conditions in SAP PI receiver determination

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Hi,

I have recently joined in a new company as a PI cunsoltant, the problem is all the implementation is already done, and now iam just dealing with UPDATES. recently my manager asked me to block some users by using x-path conditions in receiver determination(RD) i just want to know the logic of it since i never had chance to work on it in my previous company. Below are the three different type of logics which have already been set up there in RD for respective purposes.

(/ADRMAS02/IDOC/E1ADRMAS[(OBJ_TYPE!="LFA1") or (OBJ_ID!="0000100088") and (OBJ_ID!="0000100552") and (OBJ_ID!="0000115499") and (OBJ_ID!="0000128391") and (OBJ_ID!="0000129766") and (OBJ_ID!="0000158140")] EX )

(/DEBMAS05/IDOC/E1KNA1M/KTOKD = 0001) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = 0003) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = KUNA) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = Z002) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = Z004) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = ZMPA) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = ZREF) OR (/DEBMAS05/IDOC/E1KNA1M/KTOKD = ZSTA)

(/ORDERS05/IDOC/EDI_DC40/MESCOD u2260 010)

I just want to know the purpose of these filters and how to write its logic i mean want to know when to use variables like =, != EX

Thanks.