Message type: E = Error
Message class:  OIJ_EL - OIL TSW: Messages for TSW Execution Layer 
Message number: 731
Message text: Close dip reading quantity is less than open dip reading quantity
The dip quantity difference between the open and close readings for the
selection data on the TSW ticket gauge screen, that is the tank
sequence number, date, and time, is positive.
The TSW movement scenario to which the ticket is related requires a
negative result because it represents delivering into a silo object
(tank) at a destination location, or transferring from the location's
storage location (for example, 'import' storage location).
For a load scenario (tank ullage), the open dip reading must be greater
than the close dip reading.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Change the parameters (dip height/date/time) on the ticket gauge screen.
Another way to solve the issue is to use transaction O4_TIGER to display
the available dip readings for a given selection (plant/storage
location/tank sequence number, and date/time).
You can also enter a tank sequence number and date(s), and use F4 to
select the dip readings in the corresponding fields (open dip and close
dip).
Error message extract from SAP system. Copyright SAP SE.
The SAP error message OIJ_EL731, which states "Close dip reading quantity is less than open dip reading quantity," typically occurs in the context of inventory management, particularly in the Oil and Gas industry (OIJ stands for Oil Industry Solution). This error indicates that the closing dip reading (the measurement taken at the end of a period) is less than the opening dip reading (the measurement taken at the beginning of the period), which is not a valid scenario in inventory management.
Cause: Data Entry Error: The most common cause is a mistake in entering the dip readings. The closing dip reading should logically be equal to or greater than the opening dip reading unless there has been a loss or theft, which should be accounted for separately. Measurement Errors: There may be inaccuracies in the measurement process, such as incorrect calibration of measuring devices or human error in reading the measurements. System
Configuration Issues:
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