Message type: E = Error
Message class:  HRASR00_DT_FSCN_DATA - Message of Data Class for Form Scenarios 
Message number: 307
Message text: Field &1 is already bound to service field &2 of field group &3
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 HRASR00_DT_FSCN_DATA307 indicates that there is a conflict in the binding of fields within a service in the SAP system. Specifically, it means that the field specified by &1 is already bound to another service field &2 in the field group &3. This typically occurs in the context of SAP HR (Human Resources) applications, particularly when working with the SAP HR Application Services (HRASR).
Cause: Field Binding Conflict: The error arises when a field is attempted to be bound to multiple service fields within the same field group. This can happen due to misconfiguration in the service definition or when multiple services are trying to use the same field without proper separation. Duplicate Configuration: There may be duplicate entries in the configuration of the service or field group, leading to the same field being referenced multiple times. Incorrect Service Definition: The service definition might not be set up correctly, causing conflicts
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
HRASR00_DT_FSCN_DATA306 Specify a field group
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRASR00_DT_FSCN_DATA305 An operation is already defined for field group &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRASR00_DT_FSCN_DATA308 A default value was already defined for field &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
HRASR00_DT_FSCN_DATA309 An input help was already defined for field &1
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.