Manipulating with TCComponentBOMLIne in Teamcenter

Question

I'm working with Teamcenter using the Java SOA API. How can I remove the child line from the structure correctly?

Here is my code:

TCComponentBOMLine bl = bomWin.setWindowTopLine(***); // ROOT BOMLine
        
AIFComponentContext[] ctxes = bl.getChildren();
for (AIFComponentContext ctx : ctxes) {
    TCComponentBOMLine child = (TCComponentBOMLine)ctx.getComponent();
    bl.remove("bl_all_child_lines", child);
    bl.save();
}
bl.save();
bl.refresh();
bomWin.save();
bomWin.refresh();

After that, I'm adding new child lines for structure.

In the RAC all is good, but in console I see an ICCTException:

com.teamcenter.soaictstubs.ICCTException: - Wrong sign
    at com.teamcenter.soaictstubs.ICCT.getProperty(Unknown Source)

What's wrong?