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CHECK_51 - Open SQL - Escape host variables

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see https://help.sap.com/http.svc/rc/abapdocu_750_index_htm/7.50/en-US/abenopen_sql_hostvar_obsolete.htm

NB: When adding escape host variable to an Open SQL statement, you may notice false-positive message of standard check Robust Programming > Unsecure use of FOR ALL ENTRIES. Please refer to OSS note #2050568 - ATC/CI: “FOR ALL ENTRIES” analysis and host variables.