u can also try by taking source field - mapwithdefault use blank not space.........then a blank constant[] and then compare it with equalS text function and send it to creatif and then removeContext and then target field........
you can do that with message mapping, just use one of the mandatory fields (or a concatenation of them) to generate the output. as for the logging depends what you want to achieve, but you will need a udf
In PI 7.0 we read all records into a message. Then we apply java mapping program for validation. This program generally written using DOM parser will go through each record one by one and validate it with a set of requirements. if a set of records does not contain mandatory fields we send error emails to a set of users. this triggering of emails is done by RFC. In your case you can simply move to next record. In case you want to log it in PI server then you can use an ABAP program to log the error messages for each record in a table. The records which are valid can be passed onto next mapping. With use of BPM this becomes simpler to implement.
Is your mandatory field comming as separate field within source message then you can use the mapping what Aravind has posted. In case it is comming in, as part of a line then you need to post here the source and target mesage structure. Then only code for UDF or java mapping may be suggested. Also if possible include sample input and output.
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