Dear Akshay,
Please explore standard SAP before going for user exit. You have not specified which putaway strategy you are using. But from your issue, it seems that your requirement could be fulfilled using available standard setting in WM module
I assume that your requirement is to omit the first storage type in the sequence and select other storage type in the sequence based on certain criteria. You have below options
(1) Depending upon storage type indicator in material master WM1 view, you can influence storage type search in OMLY. If you know that specific material should be put-away in specific storage type then assign storage type indicator in material master. Corresponding to this storage type indicator, system would influence selective search in OMLY. Please check this
(2) Another option is, do the configuration of storage unit type in OMM1. In the same configuration node, make sure that you assign storage unit type to only specific storage type. For-ex- 001, 002 in your example. Say, SUT E1 allowed for only 001 and SUT E2 allowed for only 002.Now assign storage unit type with qty in WM2 view of material master.
Depending upon above setting, system will put-away your goods to specific storage type only provided you have mentioned that storage type in the sequence search.
(3) Use fix bin storage type strategy which I guess you must be using. You can change the sequence as 001, 002 ,000. The system would putaway the materials in 001 only if it is defined for that. Otherwise would go for 002 and 000.
(4) Please explore more on above three options. I believe your issue would resolved on 90% probability. If not then go for own pt-away strategy using user exit MWMTO003.
Thanks,
Milind