UMB : Change in stock account hitting at the time of MIRO

Question

Dear Experts ,
I have a material with a moving average price.
The material was taken in stock in initial entry. in period 10.
Then the material was consumed in period 11.
Further the material was procured . The posting period in GR was 11 & the period at the time of entry was 12.
Now the MIRO was done for the material . At the time of MIRO the material price was revised .
The MIRO entry date was in period 12 & the posting date was in period 11.
The entries for GR are :
1000     1     89          20501000     INV. OF RM          209,272.50     INR
1000     2     96          10601050     GR/IR CLEARING OTH.     209,272.50-     INR
Cenvat Postings are :
1000     1     40          21221004     EXCISE RG 23A HCESS      89.00       INR              00
1000     2     40          21221000     EXC RG 23A BED BAS       8,795.00     INR              00
1000     3     40          21221003     EXCISE RG 23A ECESS      178.00           INR              00
1000     4     50          10601230     CENVAT CLEARING            9,062.00-     INR               00
The MIRO Entries are :
1000     1     31          200173               XYZ VENDOR                           241,402.00-     INR     **
1000     2     86          10601050     GR/IR CLEARING OTH.           209,272.50     INR     25
1000     3     89          20501000     INV. OF RM                           11,572.50             INR     25
1000     4     40          10601230     CENVAT CLEARING                    9,062.00              INR     00
1000     5     40          21211000     INPUT ST  BASIC 1001             362.20                INR     
1000     6     40          21211001     INP ST EDUC.CESS1001           90.55             INR     
1000     7     40          21201000     INPUT VAT                             8,833.80 INR     25
1000     8     40          21201001     ADDITONAL VAT                        2,208.45     INR     25
AND a separate accounting document is posted with the following entries :
1000     1     99          20501000     INV. OF RM                          9,985.50-     INR
1000     2     83          40101230     CHANGE REVALUATION       9,985.50     INR
Pls tell me why sould the material get revaluated  ??? GL 40101230 is assigned to UMB.
Thanks in advance ..
Anis

Answer 1

Please tell me same issue i am getting.
System asking UMB key noit defined , we do not want to put in loss/gain from revaluation.
In one PO, we doing miro and at this time all matreial consumed in material master, there is no quantity and value.
In other PO, we doing miro for 32 quantity and at this time , 22 quantity present in material master and we getting this error .
But i do not understand , same scenario i checked in quality , it working.
please guide me
Thanks,
Dharmveer