The answer to this question can depend on various factors, including the specific terms and conditions of your probation, the laws in your jurisdiction, and the policies of your probation department.
Generally, if you are on probation, your probation officer has the authority to set certain conditions that you must comply with during the probation period. These conditions can include undergoing drug or alcohol treatment, including inpatient rehab, if it's deemed necessary for your rehabilitation and compliance with the terms of your probation.
If you have already completed inpatient rehab treatment once and your probation officer believes that you still need further treatment or if you have violated the terms of your probation and treatment is deemed appropriate as a consequence, they may require you to undergo inpatient rehab again.
It's essential to consult with a legal professional who is familiar with the laws and regulations in your specific jurisdiction and can provide you with advice based on your unique circumstances. If you have concerns about your probation terms or conditions, a lawyer experienced in criminal law and probation matters can provide you with the most accurate and relevant information.