2195219 - Syntax error due to error "implementation class does not exist"

The following dump may happen that syntax error occurs after system update, complaining that a BAdI implementation is not existing.

For instance:

The following syntax error occurred in program "SAPLFG_CONSUMER_CONNECTOR " in
 include "LFG_CONSUMER_CONNECTORU06 " in
line 596:
"Implementation class does not exist: The implementation "/IBMMON/ITM_B"
"DIMPL_ALERTINBOX" in enhancement "/IBMMON/ITM_IMPL_ALRTINBX" of the BA"
"dI "BADI_DYN_INCI_NOTIF" points to the nonexistent class "/IBMMON/ITM_"
"CL_BC_ALRT_REACT"."

The syntax error in ST22:

Netweaver based systems

SYNTAX_ERROR, Implementation class does not exist, enhancement spot, BAdI implementation, BAdI definition, ENHS_BADI_ANALYZE_GENERATE_ALL, BADI_RSANALYZE, BADIIMPL_ENH , KBA , BC-DWB-TOO-ENH , Enhancement Tools , BC-DWB-CEX-BAD , BAdIs , Problem