Please explain what is the meaning of the following massage and if it affects accuracy of results:
Warning 18E: Count exceeded the specified display limit of [5]
This warning is not related to any specific node.
Regards

This "count exceeded" feature in error checker was introduced to reduce number of messages displayed on screen for quicker review (the total number of errors/warnings is still the same and is reported in the text boxes above the grid). This will not affect calculations; if these are errors, then all of them must be resolved in order to perform the analysis, as usual.

There is a little black drop-down arrow to the right of the Error Check button on the "Caesar II Tools" toolbar; when expanded, the "Limit Repeated Messages" check box is "On" by default (you can turn it "Off" to display all messages); you can also change this count by using "Set Message Repeat Limit" option.