Process Chain that uses a DTP and locks up with CX_RSBK_REQUEST_LOCKED

Question

Hello Experts,
I am making a program to start a PC inside a loop. This Loop has several dates and ODS ID's. The problem is that inside the loop I make a call to FM RSPC_API_CHAIN_START, after this I have a WAIT UNTIL 30 SECONDS command so that the process has enough time to finish loading data. Each time the loop starts I change the name of the .txt flat file that te PC is going to load and store it inside a Z table with a rutine inside the DTP calling it every loop cycle. And so every time the Process Chain starts it should load a different file into a specifyc ODS. The problem comes at the second loop in which through the RSA1 transaction I find out that the chain is locked with an exception CX_RSBK_REQUEST_LOCKED and the subsequent calls to the Process Chain simply don't start at all. One solution I found was to delete the last Petition Request ID in the table RSSTATMANPART.
I use RSSM_DELETE_REQUEST to delete that request using that ID and the cube name.
Now this doesn't work either.
PROGRAM SUMMARY:
LOOP WITH ODS THAT NEED LOADING INTO BW ODS
    DELETE PETITION REQUESTS FROM RSSTATMANPART WITH YELLOW OR RED STATUS.(So that PC can start)
    CHANGE FILE THAT DTP ROUTINE WILL LOAD
    START PROCESS CHAIN
    WAIT A CERTAIN AMOUNT OF TIME FOR PC TO FINISH
ENDLOOP.
Edited by: Antonio Alejandro Ortega Vergani on Apr 12, 2011 12:05 AM

Answer 1

Hi saveen,
I've checked the transaction sm50 to check the available processes and I have 8 BTC(batch), 5 DIA(dialog), 2 UPD(update), 1 ENQ(enqueue) and 1 SPO(spool). Are these the ones you are asking about? I assume you refer to BTC which I believe 8 is enough....correct me if Im wrong here as Im starting out with this please.
Thing is that Im trying to automate this whole process (for loading various file types(headers.txt, details.txt, payments.txt, etc), for various centers and several months...this is why I want to automate the whole process, so I dont have to go manually through all this data loading. So what I did was try to start the chain inside a loop for every new combination of dates that DIDN'T EXIST in the ODS tables. The process chain is supposed to call a DTP that uses a routine to see which file is going to upload to BW but only does it the first time.
The problem comes with the second cicle of the loop in which the petition request for the DTP is already green, nevertheless the next start of the chain doesn't come as there seems to be no creation of another request and the exception CX_RSBK_REQUEST_LOCKED in the transaction RSPC.
Appart from this whenever I try to delete the last request so that this way it does create another request(rnr) in RSSTATMANPART through the use of RSPC_API_CHAIN_START the data in my ODS does not stay and is deleted.