Eddy, you can apply for a CSM job if you have:
experience as a Senior Cabin Crew Member (Cabin Service Director, Cabin Manager or Purser) with 12+ months full time or equivalent experience in a SCCM role in the last 5 years of which 3 months is in the last 3 years in BA
Or
36+ months full time or equivalent as current BA Cabin Crew in the last 6 years plus 12+ months experience in a people management or leadership role (internal or external to BA) within the last 6 years, which includes team, performance, and resource management.