Message type: E = Error
Message class:  OIJ_LT - TSW Messages in laytime and demurrage module 
Message number: 028
Message text: Demurrage cannot be computed.Potential laytime = actual laytime = 0.
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_LT028, which states "Demurrage cannot be computed. Potential laytime = actual laytime = 0," typically occurs in the context of the SAP Oil and Gas (OIJ) module when there is an issue with the laytime calculations for a shipment or transportation process. Here’s a breakdown of the potential causes, solutions, and related information for this error: Causes: Missing Data: The error often arises when there is insufficient data to calculate laytime. This could include missing or incorrect entries for the start and end times of the laytime period. Incorrect Configuration: The configuration settings for laytime and demurrage calculations may not be set up correctly in the system. Status of Shipment: If the shipment or transportation document is not in the correct status (e.g., not completed or not yet started), the system may not be able to compute laytime. Zero Values: If both potential laytime and actual laytime are recorded as zero,
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
OIJ_LT027 Actual laytime calculation failed for pegid = &1.
What causes this issue?  Either the start laytime event or end laytime event could not be determined . The system issues an error message and will not...
OIJ_LT026 Total actual laytime = &1 &2 &3 &4.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_LT029 Selected nom.line not been pegged for laytime for item frt contract.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
OIJ_LT030 Actual laytime calculation could not be performed.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.