Message type: E = Error
Message class:  OIJ_PRORATE - TSW: Message class for prorate calculation 
Message number: 030
Message text: Unit & is not convertible to unit &.
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message OIJ_PRORATE030, which states "Unit & is not convertible to unit &," typically occurs in the context of unit conversion in the SAP system, particularly within the Oil and Gas (OIJ) module. This error indicates that there is an issue with converting one unit of measure to another, which can happen for various reasons. Causes: Unit of Measure Configuration: The units involved may not be properly configured in the system. This includes missing conversion factors or incorrect settings in the unit of measure (UoM) table. Incompatible Units: The units being used may not be compatible for conversion. For example, trying to convert a volume unit to a weight unit without a defined conversion factor. Missing Conversion Factors: There may be no defined conversion factors between the two units in the system. Data Entry Errors: Incorrect data entry in transactions or master data that involves units of measure can lead to this error. Solutions: Check
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
OIJ_PRORATE021 No ticket exists yet for the pegged demand/supply item.
What causes this issue?  The item you selected is pegged with demand/supply pegging. However no ticket is posted yet for the pegged item.System Respon...
OIJ_PRORATE018 No temperature-corrected UoM has been defined for the ticket type &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_PRORATE031 Unit & is not a valid unit.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_PRORATE032 Demand material &1 is not equal to demand material &2
What causes this issue?  Items with different demand materials were pegged.System Response  The system issues an error message and will not allow you ...
Click on this link to search all SAP messages.