Message type: E = Error
Message class:  CRM_IC_SALES - CRM-IC-SLO: Messages for the IC Webclient Sales Area 
Message number: 102
Message text: ATP check carried out for all items
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 CRM_IC_SALES102 indicates that an Availability Check (ATP check) has been performed for all items in a sales order or transaction, but there may be issues related to the availability of the products or the configuration of the ATP check itself.
Cause:
Configuration Issues: The ATP check may not be properly configured in the system. This could include settings in the material master, sales order type, or ATP check settings in the system. Stock Availability: The items in the sales order may not have sufficient stock available to fulfill the order. Material Master Settings: The material master may not have the correct settings for ATP checks, such as the availability check type or the relevant plant settings. Sales Order Type: The sales order type may not be set up to perform ATP checks correctly. Business Rules: There may be specific business rules or conditions that prevent the order from being processed due to
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CRM_IC_SALES101 ATP check carried out for selected items
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRM_IC_SALES100 Unexpected error during ATP check
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRM_IC_SCRGRP000 Group is referenced by other role
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CRM_IC_SCRGRP001 Group is referenced by scripts
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.