ABO - Error for saveBOM contains "Unable to parse value 'Euro price not defined.'"

Summary:

We receive an error on ABO process, particularly on abo_copyRootToTransaction corresponding to saveBOM line (details on content). Any suggestion on root cause?

Content (required):

PFB Error details:

DESC: ERROR: Server returned HTTP response code: 500 for URL: https://windtrespa3dev.bigmachines.com/rest/v13/assets/actions/modify - 

{"o:errorDetails":[{"Instance":"abo_20bc381e-ff47-40c3-a17d-0782b022e4f9","o:errorDetails":[

{"o:errorDetails":[{"title":"Unable to parse value 'Euro price not defined.' as an unformatted amount. :: 

Error Trace-[(Library Variable Name, BML Line No): (util._ORCL_ABO_abo_copyRootToTransaction, 156)]"}],

"title":"Unable to parse value 'Euro price not defined.' as an unformatted amount.