Why is this lexer not deterministic?

Hi all!

I try to write a small XML lexer using Antlr 2.7.4 (see code below). 
When compiling the Lexer the following message is returned:

minimal.g: warning:lexical nondeterminism between rules X and CDATA upon
minimal.g:     k==1:'<'
minimal.g:     k==2:'A'
minimal.g:     k==3:'B'

I do not understand this message because the CDATA production does 
recognize the sequence '<', 'A', 'B'.

Can anyone help?

Best regards,
Stefan Wachter


PS: Here is the lexer:

class MyLexer extends Lexer;

options {
	k=3;
	charVocabulary = '\3'..'\377';
	caseSensitive=true;
}

X : "<ABC>" ;

CDATA :
   ( CDATA_SECT | ~( '&' | '<' | ' ' | '\t' | '\n' | '\r' ) )+
;

protected CDATA_SECT : "<![CDATA[" CDATA_DATA "]]>" ;

protected CDATA_DATA :
   ( ~']' | ']' ~']' | "]]" ~'>' )*
;


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