These messages exist because they often point to an incorrect value of S1. See DBDOC_TSTALM.ERR. If cloned logic was not completed, and the logic was cloned on another page, this message will occur along with a message saying the target is tested by multiple TSTALM blocks.
This message is cosmetic in that DBDOC makes TSTALM blocks easier to manage. However, the test is capable of finding errors that are not easily found any other way.
--Module 7,51,04 TSTALM Report Tested block on different page: TSTALM block Module 7,51,04 Block 4207 on 7510442 checks Module 7,51,04 Block 174 on 7510457.
This error can be built directly into Hyperview. For more information, see the article Building error reports into the M14.