Example six layer board with Corrupted Mid Layer IDs.
.Layer_ID and .Layer_Name
Example . . . Corrupt Mid Layer IDs
The Fix . . .
Backup the Project Design Files using Project > Project Packager
Open the PcbDoc . . .
Import Changes from Project to Update the Netlist and Design Rules in the PcbDoc.
Run DRC checks, take note of any reported errors.
Create and open a Copy of the PcbDoc in the project.
Design > Layer Stack Manager
Export Stackup as CSV, then include Impedance Screen Captures in Excel.
Delete all Mid Layers from the Corrupt Stackup.
Then add Mid Layers as needed.
Save Stackup to the PcbDoc, then check Mid Layer IDs and Layer Names.
Example Corrected Mid Layer IDs.
Design > Layer Stack Manager
Enter Material Thickness and Impedances as needed.
Save the fixed Stackup to the copy of the PcbDoc
Copy each Mid Layer from Original PcbDoc to Copy of PcbDoc.
Suggested Selection Filter Settings for Copying Mid Layers
Show all Mid Layers and use Signal Layer Mode.
Hide the Multi-Layer to avoid Selecting the Board and Board Cutouts.
Copy each Mid Layer from the Original PcbDoc to Copy of PcbDoc.
Use Edit > Paste Special > Check Paste on Current Layer and Keep Net Name.
Edit Design Rules and Fix Trace Width Rules as needed, including Diff Pairs.
Import Changes from Project to update the Netlist and Design Rules in the Copy.
Run DRC checks, take note of any reported errors.
Done !
