In the remote function call, the system issues the following error message as a text for the RFC exception SYSTEM_FAILURE:
"CPIC server sends screen &P1 &P2 (termination)"
with &P1 = program name and &P2 = screen number, or, as of Release 3.0F, the error message:
"Screen output without connection to user"
or in online mode, the following message:
Maximum number of sessions reached
CALL_FUNCTION_REMOTE_ERROR (as an ABAP/4 runtime error) with the long text: CPIC server sends screen, ... (termination).
DYNPRO_SEND_IN_BACKGROUND (as ABAP/4 runtime error on the RFC server) with the text: Screen output without connection to user.
00213, Maximum number of sessions reached, 14411,
Screen output without connection to user
Reason and Prerequisites
You tried to send screens or lists using an RFC connection.
These error messages appear in the following scenarios:
- During RFC communication between two R/3 systems or within the same R/3 system, the following error situations may occur:
- When you execute the calling program in a batch process, the output of screens or lists in the server program always terminates the communication, regardless of the user type used. Note that RFC server programs are always executed in dialog processes.
- When you execute the calling program in a dialog process, this action leads to the communication being terminated due to the missing user authorization. The user for the RFC connection does not have the required dialog user type. Check the user profile (transaction SU01 or using the menu Tools -> Administration -> User maintenance -> User) for the user type 'dialog'. An RFC user of type CPIC, batch or BDC would lead to a termination when outputting screens or lists in the called function module. This occurs if the target system is an R/3 system with an SAP kernel of Release 3.0E or higher. To find this information on the target system, call transaction SM51 and choose 'Release Notes'.
- In the case of RFC communication between an R/3 system and an external program (for example, C, Visual Basic or other external programs), outputting screens or lists always terminates the communication, regardless of the user type, unless the external program uses a SAPGUI (RFC with SAPGUI).
- If you use asynchronous RFC for generating modeless windows, the short dump occurs when the number of open sessions is already reached. As a result, another screen/list output as modeless screen is not possible.
Note 755912 with the patch text "CST Patch Collection 30 2004" solves the runtime error DYNPRO_SEND_IN_BACKGROUND when you use the asynchronous RFC to create modeless windows.
- If you use synchronous RFC to generate windows with modes, the short dump occurs, if the remote ABAP context is removed using ABAP language elements such as LEAVE TO statements or SUBMIT <report> or by entering the function code '/n<transaction code>' into the OK code field. When generating alternative sessions from an RFC context, the following types of entries are made in the developer tracefile (dev_w*):
M *** ERROR => ThCpicInitTermConv: no user key [thxxcpic 8066]
- Comment: Depending on the screen output, various ABAP runtime errors are logged.
If a list or screen is processed in the application transaction, this leads to ABAP runtime error DYNPRO_SEND_IN_BACKGROUND.
If an RFC function call with destination "SAPGUI" is processed in the application transaction (like the call of function module "SAPGUI_PROGRESS_INDICATOR"), this leads to ABAP runtime error CALL_FUNCTION_OPEN_ERROR.
- If the following message is displayed when you execute asynchronous RFC in online mode,
Maximum number of sessions reached (error number: 14 411)
although the maximum number of sessions has not been reached yet, a screen output was carried out in the called function module.
- If an internal mode is processed in the RFC function module using one of the ABAP language elements "SUBMIT <report> and RETURN", "CALL TRANSACTION <tcode> USING", no screen output such as list or screen processing must be carried out in this internal mode. This typical problem occurs when executing WRITE statements in a SUBMIT <report> and RETURN statement.
- Comment: Executing the WRITE statement in the RFC function module does not lead to any screen output.
You can find additional information in the form of syslog entries in transaction SM21, as well as in the error message 'Outputting screen without connection to user' and in the dump analysis in transaction ST22.
https://service.sap.com/sap/support/notes/49730 (SAP Service marketplace login required)
Key words :    , screen output, function module, target system, runtime error, maximum number, without connection, communication between, calling program, kernels patch, patch level, external program, output without, sessions reached, error message,