Does a second opinion have a suspensive effect on reintegration and possible legal measures?

A second opinion does not have a suspensive effect. An employee is legally bound by the agreements made by the employer based on the advice given by the first company doctor. This remains the case until the first company doctor decides to follow the second opinion and communicates this advice to the employer. After all, the second opinion company doctor has no right to communicate with the employer.
The report can, however, be used later by the employee in any legal proceedings or when applying for WIA benefits.