Code completion failure

i use delphi 7 on windows 7
code completion fails (errors in source code) but when i relocate the procedure higher in the implmentation section code completion works although all procedures are already declared in the interface section. this is frustrating as actually there is no error and the project compiles well. i need code completion because i didn't study delphi. may be the unit got large, may be a conflict with other units. i worked in this project several years ago and left it for a while. thank you

You need to post the actual code for us to diagnose the issue.