Excel VBA Macro Protection Fix

I need assistance with an Excel workbook containing two sheets with data entries, formulas and working VBA code. The workbook functions correctly until I lock specific cells and protect the sheets with a password. Once protected, running the macro results in an error while entering data.

Key Requirements:
- Ensure the macro can run smoothly while specific cells are locked and sheets are protected.
- Allow data entry only in designated input cells.
- Maintain the ability to modify other cells through the macro without manual unlocking.
- Prevent unauthorized modifications to the VBA code and Excel workbook.

Ideal Skills and Experience:
- Proficiency in Excel VBA programming and debugging.
- Experience with Excel sheet protection and cell locking.
- Ability to implement secure solutions that maintain workbook integrity.
- Strong problem-solving skills to identify and resolve macro errors related to sheet protection.

I'm looking for a solution that ensures the macro operates seamlessly without compromising the security of the workbook.