1. if modules placed in SVN without svn:externals, everything works fine
assembly/
project1
project2
project3

---------- cut ------------
Started by an SCM change
Updating https://10.218.35.135:9443/svn/test/sandbox/assembly
U project3\ivy.xml
At revision 9
Parsing Ivy Descriptor Files
>>>Triggering ru.test:project3
Finished: SUCCESS
---------- cut ------------

after changing file in project3, it triggers project3 to build (marked with >>>)

2. In case of svn:externals use:

hudson-ivy/
^/packages/project1/trunk project1
^/packages/project2/trunk project2
^/packages/project3/trunk project3

---------- cut ------------
Started by an SCM change
Updating https://10.218.35.135:9443/svn/test/assemblies/hudson-ivy
Получено 'https://10.218.35.135:9443/svn/test/packages/project1/trunk' в -1 в 'C:\.hudson\jobs\hudson-ivy2\workspace\project1'
AU project1\test.txt
At revision 14
Получено 'https://10.218.35.135:9443/svn/test/packages/project2/trunk' в -1 в 'C:\.hudson\jobs\hudson-ivy2\workspace\project2'
At revision 14
Получено 'https://10.218.35.135:9443/svn/test/packages/project3/trunk' в -1 в 'C:\.hudson\jobs\hudson-ivy2\workspace\project3'
At revision 14
At revision 14
no change for https://10.218.35.135:9443/svn/test/assemblies/hudson-ivy since the previous build
no change for https://10.218.35.135:9443/svn/test/packages/project2/trunk since the previous build
no change for https://10.218.35.135:9443/svn/test/packages/project3/trunk since the previous build
Parsing Ivy Descriptor Files
Finished: SUCCESS
---------- cut ------------

project1 changed, svn update got changes, "no change for" string in log absent for project1
but project build not triggered!

All the settings for projects are the same:
'Incremental build'
'Build modules as separate jobs'
options are turned on

so i don't know the way how to finish my CI.
is this information enogth?