BAPI_OBJCL_CHANGE - Superior class locked (C4 200)

Hi,

I run massive parallel batch updates using BAPI_OBJCL_CHANGE on a specific class of our equipments.

In an equipment, I can see that the class I use get some of its values from superior classes.

When I run my batch, some objects get a C4 200 error (Superior class locked).

Since when a BAPI can't be used in parallel?

Why it happens?

My BAPI call is very straight forward (I specify objectkey, objecttable, classnum and classtype), and I do a COMMIT after each 100 objects.

Thanks,