https://userapps.support.sap.com/sap/support/knowledge/en/2579566
2579566 - Error BQ106 in KO22/KO26 | SAP Knowledge Base Article
A reduction of the budget for an internal order in transactions KO22/KO26 is desired; however, the error message BQ106 "Overall budget less than cumulative...
sap knowledgeerrorbasearticle