Hi Diego,
have you implemented the buffer update, that I've spotted in the example implementation of the BADI?
*- The exporting parameter indicates how to handle the buffer.
*- We want to modify the buffer with our values. This means that new
*- entries are added to the buffer and existing ones are updated
*- with our values.
ex_buffer_update = if_ex_wf_bwp_dynamic_columns~c_buffer_modify.
Florin