Hello - I've received an error when trying to settle an internal order (asset under construction) entitled "Complete allocation structure Y1".  I've gone and read up on some old on-prem help on the subject (could not find any in cloud, nothing mentioned in the test scripts in best practice explorer), and think I generally understand the concept.  In order to complete my understanding, as well as execute the required action, can anyone help me to locate where to actually check/modify allocation structures?  

Any general overview of allocation structures anyone would like to give, or helpful links, are most welcome.