BAPI_MATERIAL_SAVEDATA not updating field Control Key for QM in Procurement

[shmilo66661]

Hi experts,

Anyone has a clew why bapi "BAPI_MATERIAL_SAVEDATA" doesn't update field MARC-SSQSS by clientdata-CTRL_KEY? I'm setting it to SPACE and 'X' in its clientdatax corresponding field but it remains with its old value.

Thanks in advance!